Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y nang) OR (ky nang)) cao hoi. hieu va cam tuc ((va thanh) or (gia thanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ky nang)) cao hoi. hieu va cam tuc ((va thanh) OR (gia thanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ky nang)) cao hoi. hieu va cam tuc ((va thanh) or (gia thanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ky nang)) cao hoi. hieu va cam tuc ((va thanh) or (gia thanh)) thai cua tre*.