Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh tai » thanh tai, hang tai, han tai
nam thuc » nam thuoc, am thuc, nam thu
lieu van » hieu van, sieu van, lieu nano
sach dao » lanh dao
cao hoi » cau hoi, co hoi, cao hoc
sach lo » sach doi, sach hoi, sach moi
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach lo) or (sach dao)) nang cao hoi. ((lieu van) or (lieu va)) nam thuc va hanh tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lo) OR (sach dao)) nang cao hoi. ((lieu van) OR (lieu va)) nam thuc va hanh tai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach lo) or (sach dao)) nang cao hoi. ((lieu van) or (lieu va)) nam thuc va hanh tai cua viet*.