Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cam tuc » cam xuc, nam thuc, dam thuc
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
cam tu » cam thu, nam tu, dam tu

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