Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
danh hai » dang hai, lanh hai, manh hai
thuc dan » thuc hanh, hoc dan, thuc vat
hai cau » hai chau, hai chu, hai hau
thuc va » thuc vat, thuc day
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
van cau » van dau, van hau, van chat
ma hoi » xa hoi, ma hoa, me hoi

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 ((ma hoi) or (mai hoi)). hieu van cau ((thuc va) or (thuc dan)) danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((ma hoi) OR (mai hoi)). hieu van cau ((thuc va) OR (thuc dan)) danh hai cau treo.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((ma hoi) or (mai hoi)). hieu van cau ((thuc va) or (thuc dan)) danh hai cau treo*.