Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
theo toc » ho toc, thac toc, theo bo
toc sach » hoc sach, doc sach, thuoc sach
anh dung » anh dong, anh huong, sach dung
dung cua » dung luan, dung cho
tan toan » tan tran, tap toan, van toan
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 cua ((nhung cong) OR (thong cong)) tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo toc sach - anh dung cua ((nhung cong) OR (thong cong)) tan toan cao*".