Perhaps you should try some spelling variations:
gender age » gender wage, under age, gender a
chung kang » chan kang, chung kay, chung tong
yang yang » wang yang, wang yan
zhong tai » hong tan, hong hai, zhong zhi
yang xi » yang di, yang yi, yang jui
2 zhong » 2 hong, ji zhong, wu zhong
yang i » yang di, yang yi, yang li
age 2 » age _, age a, age 6

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yang) OR (chung kang)) ((yang i) OR (yang xi)) gender age 2 zhong tai ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (chung kang)) ((yang i) or (yang xi)) gender age 2 zhong tai ;*.