Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hanh hai » thanh hai, nhanh hai, hang hai
lam truc » lam truoc, nam truc, lam thuoc
hieu van » hieu va, thien van, lieu va
hai cau » hai chau, hai chu, hai hau
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
van lam » van nam
su sach » so sach, vu sach
ly hang » ly quang
ly vang » ly van, ly quang
ly nang » ky nang, ly quang, may 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: su sach ((((ly nang) or (ly vang))) or (ly hang)) ma hoi. hieu van lam truc va hanh hai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ly nang) OR (ly vang))) OR (ly hang)) ma hoi. hieu van lam truc va hanh hai cau theo.
• Adding a wildcard symbol may retrieve word variants: su sach ((((ly nang) or (ly vang))) or (ly hang)) ma hoi. hieu van lam truc va hanh hai cau theo*.