Perhaps you should try some spelling variations:
chat thien » phat trien, cai thien, phat hien
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
lam chat » luan chat, cao chat, ly chat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
duc van » duc va, duc manh, duc phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu van cac ((duc van) or (duc tan)) hanh lam chat thien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van cac ((duc van) OR (duc tan)) hanh lam chat thien.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van cac ((duc van) or (duc tan)) hanh lam chat thien*.