Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cao hoi » cau hoi, cao hoc, tao hoi
hai chi » thai chi, tai chi, hai thi
tu sach » thu sach, su sach, te sach
co hoi » co hoc, co loi
va nam » van nam, ha nam, va nay
y nang » ky nang, ly nang, v nang

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 y nang ((cao hoi) or (co hoi)). hieu va nam thuc va hanh ((hai chau) or (hai chi)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((cao hoi) OR (co hoi)). hieu va nam thuc va hanh ((hai chau) OR (hai chi)) treo.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((cao hoi) or (co hoi)). hieu va nam thuc va hanh ((hai chau) or (hai chi)) treo*.