Perhaps you should try some spelling variations:
te sach » toc sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
tinh » trinh, dinh, minh

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 (v nang)) ma hoi. hieu va cam tuc ((may tinh) or (gia thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) ma hoi. hieu va cam tuc ((may tinh) OR (gia thanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) ma hoi. hieu va cam tuc ((may tinh) or (gia thanh)) tai cua tre*.