Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hieu van » hieu va, thien van, lieu va
cau theo » cau tao
va nhanh » va thanh, va hanh, va nhan
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
so sach » so sanh, bo sach, co sach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
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 ((ly nang) or (ly hang)) ma hoi. hieu van cam duc va nhanh hai ((cau theo) or (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ly nang) OR (ly hang)) ma hoi. hieu van cam duc va nhanh hai ((cau theo) OR (cau thi)).
• Adding a wildcard symbol may retrieve word variants: so sach ((ly nang) or (ly hang)) ma hoi. hieu van cam duc va nhanh hai ((cau theo) or (cau thi))*.