Perhaps you should try some spelling variations:
tuong hieu » thuong hieu, trong hieu, guong hieu
dai tuong » dai cuong, doi tuong, dai duong
thi lien » thi lan
tai lieu » vat lieu
hieu tuc » hieu thuc, hieu luc, hieu thuoc
tuc giai » thuc giai, tac giai, tuc gia
tu sach » thu sach, su sach, te sach

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 ((thi lien) or (tai lieu)) dai tuong hieu tuc giai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi lien) OR (tai lieu)) dai tuong hieu tuc giai.
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi lien) or (tai lieu)) dai tuong hieu tuc giai*.