Perhaps you should try some spelling variations:
yang malawi » ghana malawi
human gene » human genome, human gender, human genetic
human bone » human bones, human body
yang yang » wang yang, wang yan
yang jin » yang jie, yang jun, ying jin
law main » law pain, law making, new main
wong yue » wang yue, hong yu

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

• Performing a fuzzy search may retrieve terms with similar spellings: yang yang malawi ((human gene) OR (human bone)) ((yang jin) or (law main)) wong yue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang malawi ((human gene) OR (human bone)) ((yang jin) OR (law main)) wong yue ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang malawi ((human gene) OR (human bone)) ((yang jin) or (law main)) wong yue ;*".