Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
thu cac » tu cac, thu xac, thu cuc
hieu va » lieu va
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho
co va » co ma, so va, cu va
do va » do van, so va

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

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