Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » hieu qua
duc van » duc va, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
su tai » su thi, tu tai
tai ky » thai ky, trai ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su tai ky tang xa hoi. ((hieu va) or (lieu va)) cam ((duc van) OR (duc tan)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky tang xa hoi. ((hieu va) OR (lieu va)) cam ((duc van) OR (duc tan)) hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su tai ky tang xa hoi. ((hieu va) or (lieu va)) cam ((duc van) OR (duc tan)) hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su tai ky tang xa hoi. ((hieu va) or (lieu va)) cam ((duc van) OR (duc tan)) hanh thai cua tre*.