Perhaps you should try some spelling variations:
items doing » its doing, terms doing, systems doing
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
yang data » ring data, yang dali, yang maha
data test » data tell
hoang suk » hoang vu, chong suk, yong suk
hoang sy » hoang vu
rong su » rong yu, cong sun, jeong su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang yang data test items doing ((((hoang suk) or (rong su))) or (hoang sy)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yang data test items doing ((((hoang suk) OR (rong su))) OR (hoang sy)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yang yang data test items doing ((((hoang suk) or (rong su))) or (hoang sy)) ;*.