Perhaps you should try some spelling variations:
mai chau » lai chau, moc chau, a chau
tai chau » lai chau, hai chau, thi chau
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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: tu sach ky sang ma hoi. hieu van cam ((xuc va) or (tuc va)) hanh ((tai chau) OR (mai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. hieu van cam ((xuc va) OR (tuc va)) hanh ((tai chau) OR (mai chau)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ma hoi. hieu van cam ((xuc va) or (tuc va)) hanh ((tai chau) OR (mai chau)) tre*".