Perhaps you should try some spelling variations:
hanh may » hanh ma, hanh mau, hanh ngay
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
dam tuc » dam thuc, dao tuc, nam thuc
va hanh » van hanh, va thanh, va danh
va hieu » van hieu, va dieu, va hien
ma hoi » mai hoi, xa hoi, ma hoa
dam tu » nam tu, cam tu, tam tu
may va » may vi, day va

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 nang ma hoi. lieu va ((dam tuc) or (dam tu)) va hanh may va hieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. lieu va ((dam tuc) OR (dam tu)) va hanh may va hieu.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. lieu va ((dam tuc) or (dam tu)) va hanh may va hieu*.