Perhaps you should try some spelling variations:
te sach » toc sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cam tuc » cam xuc, nam thuc, dam thuc
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
cam tu » cam thu, nam tu, dam tu
va dan » ca dan, va dao, va dau

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 ((ky lang) or (ky dang)) xa hoi. hieu ve ((cam tuc) or (cam tu)) va dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky dang)) xa hoi. hieu ve ((cam tuc) OR (cam tu)) va dan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky dang)) xa hoi. hieu ve ((cam tuc) or (cam tu)) va dan dai cua tre*.