Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
dung doi » huong doi, dung tai, dung co
vat dung » van dung, va dung, viet dung
cham tuc » pham thuc, tham thuc, cham soc
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
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 ((sach tu) or (sach y)) nang o hoi. hieu qua ((cham tuc) or (nham thuc)) vat dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach y)) nang o hoi. hieu qua ((cham tuc) OR (nham thuc)) vat dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach y)) nang o hoi. hieu qua ((cham tuc) or (nham thuc)) vat dung doi cua tre*.