Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
hai hau » dai hau, hai hai, lai chau
so sach » so sanh, bo sach, co sach
van lam » van nam
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ma hoi. hieu van lam ((tuc xa) or (thuc va)) danh ((hai chau) or (hai hau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. hieu van lam ((tuc xa) OR (thuc va)) danh ((hai chau) OR (hai hau)) treo.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. hieu van lam ((tuc xa) or (thuc va)) danh ((hai chau) or (hai hau)) treo*.