Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
danh hai » dang hai, lanh hai, manh hai
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
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 y nang ((ma hoi) or (mai hoi)). hieu van nam ((tuc va) or (thuc vat)) danh hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (mai hoi)). hieu van nam ((tuc va) OR (thuc vat)) danh hai cau triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) or (mai hoi)). hieu van nam ((tuc va) or (thuc vat)) danh hai cau triet*.