Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
thu xac » thau xay
mai hoi » mai khoi, dai hoi, lai hoi
cac dai » cac dan, cac bai, can dai
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
xac ky » cac ky, sac ky, bac ky
ma hoi » xa hoi, ma hoa, me hoi
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu xac ky nang ((ma hoi) or (mai hoi)). ((hieu van) or (lieu va)) cac dai va hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky nang ((ma hoi) OR (mai hoi)). ((hieu van) OR (lieu va)) cac dai va hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: thu xac ky nang ((ma hoi) or (mai hoi)). ((hieu van) or (lieu va)) cac dai va hanh vai cua vat*.