Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cau hoa » cau hoi
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, va hanh
tai duc » tai cuc, mai duc, tai du
duc tre » duoc tren, duc tien

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang cau hoa. hieu van cam xuc ((van hanh) or (va danh)) tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cau hoa. hieu van cam xuc ((van hanh) OR (va danh)) tai duc tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cau hoa. hieu van cam xuc ((van hanh) or (va danh)) tai duc tre*.