Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
sach ly » sach y, sach lo, sach ty
hai cau » hai chu, hai hau, hoi cau
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
va danh » va dinh, va hanh, dia danh
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang xa hoi. hieu van cam thuc ((va danh) OR (va dan)) ((hai cau) or (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang xa hoi. hieu van cam thuc ((va danh) OR (va dan)) ((hai cau) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang xa hoi. hieu van cam thuc ((va danh) OR (va dan)) ((hai cau) or (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang xa hoi. hieu van cam thuc ((va danh) OR (va dan)) ((hai cau) or (hai chau)) treo*.