Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
khach ky » hanh ky
thanh ky » hanh ky, than ky, thanh tay
va thanh » gia thanh, va tinh, le thanh
sinh cua » manh cua, dinh cuu, sinh va
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
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: vu ((khach ky) OR (thanh ky)) nang x ho. hieu qua cac xuc ((va thanh) or (ban thanh)) sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((khach ky) OR (thanh ky)) nang x ho. hieu qua cac xuc ((va thanh) OR (ban thanh)) sinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((khach ky) OR (thanh ky)) nang x ho. hieu qua cac xuc ((va thanh) or (ban thanh)) sinh cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((khach ky) OR (thanh ky)) nang x ho. hieu qua cac xuc ((va thanh) or (ban thanh)) sinh cua tre*.