Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va thieu » va thiet, va hieu, va tieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
va hanh » va thanh, va danh, ban hanh
ma hoi » mai hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
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) or (xa hoi)). lieu va cam tuc ((va hanh) OR (van hanh)) may va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (xa hoi)). lieu va cam tuc ((va hanh) OR (van hanh)) may va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (xa hoi)). lieu va cam tuc ((va hanh) OR (van hanh)) may va thieu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (xa hoi)). lieu va cam tuc ((va hanh) OR (van hanh)) may va thieu*.