Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
cho nhung » cho chuong, cua nhung, thi nhung
theo toc » ho toc, thac toc, theo bo
toc sach » hoc sach, doc sach, thuoc sach
anh dung » anh dong, anh huong, sach dung
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo toc sach - anh dung cho nhung ((cong tan) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo toc sach - anh dung cho nhung ((cong tan) OR (cong thanh)) toan cao*.