Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
hang tai » hang va, dung tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
van tai » von tai, van tuan
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu van cao duc manh ((thanh tai) or (((hang tai) or (van tai)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van cao duc manh ((thanh tai) OR (((hang tai) OR (van tai)))) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van cao duc manh ((thanh tai) or (((hang tai) or (van tai)))) cua tre*.