Perhaps you should try some spelling variations:
trang cua » tranh cua, tang cua, trung cua
tong cong » trong cong, cong cong, dung cong
hieu luc » hieu luat, hieu qua
hang cua » mang cua, hang ca, huong cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((te sach) or (hieu luc)) - hanh ((trang cua) or (hang cua)) tong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((te sach) OR (hieu luc)) - hanh ((trang cua) OR (hang cua)) tong cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((te sach) or (hieu luc)) - hanh ((trang cua) or (hang cua)) tong cong dan toan cao*.