Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
cau tuc » cau truc, cau tu, cau luc
hai cau » hai chu, hai hau, hoi cau
va danh » va dinh, va dan, va hanh
su sach » vu sach
tai hoi » tai khoi, dai hoi, tai hai
so sach » so sanh, bo sach, co sach
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

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) or (so sach)) y nang tai hoi. hieu van cau tuc va danh ((hai cau) OR (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang tai hoi. hieu van cau tuc va danh ((hai cau) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang tai hoi. hieu van cau tuc va danh ((hai cau) OR (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang tai hoi. hieu van cau tuc va danh ((hai cau) OR (hai chau)) treo*.