Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cac thuc » cac thu, can thuc, cay thuc
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
sach ly » sach lo, sach ty, sach hay
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach ly) or (sach y)) hang xa hoi. hieu ve ((cac thuc) or (cach thuc)) van hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ly) OR (sach y)) hang xa hoi. hieu ve ((cac thuc) OR (cach thuc)) van hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: co ((sach ly) or (sach y)) hang xa hoi. hieu ve ((cac thuc) or (cach thuc)) van hanh tai cuc tre*.