Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
so sac » so dac

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

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