Perhaps you should try some spelling variations:
sach kem » hanh kem
anh thuc » am thuc, dan thuc, anh tu
nang ra » nang ma, lang ra, nang ro
hieu ve » hieu va, hieu van
don dai » do dai, don tai, duong dai
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ra hoi » ra khoi, xa hoi, va hoi
va don » va dong, va doc, va do

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach kem) or (sac ky)) nang ra hoi. hieu ve ((cac hop) or (anh thuc)) va don dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang ra hoi. hieu ve ((cac hop) OR (anh thuc)) va don dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang ra hoi. hieu ve ((cac hop) or (anh thuc)) va don dai cua tre*.