Perhaps you should try some spelling variations:
sach tham » sach nha
cach thuc » anh thuc, cac thu
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cuu tre, cua triet, dua tren
ve chat » va chat, van chat
chat do » chat deo, chat doc, chat co
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
do van » dao van, vo van, so van
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((cach thuc) or (sach tham)) nang cao hoi. hieu ve chat do van hanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((cach thuc) OR (sach tham)) nang cao hoi. hieu ve chat do van hanh vai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thu ((cach thuc) or (sach tham)) nang cao hoi. hieu ve chat do van hanh vai ((cua tre) or (cua te))*.