Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
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 tan, duc manh
su tai » su thi

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