Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
dung doi » huong doi, dung tai, dung co
van dung » van dong, xay dung, tin dung
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
cach tu » cach thuc
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((cach tu) or (sach y)) nang o hoi. hieu qua ((cham tuc) or (nam thuc)) van dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((cach tu) OR (sach y)) nang o hoi. hieu qua ((cham tuc) OR (nam thuc)) van dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((cach tu) or (sach y)) nang o hoi. hieu qua ((cham tuc) or (nam thuc)) van dung doi cua tre*.