Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu tach » chiet tach, chieu sach, chiu trach
tranh cac » thanh cac, tranh cai, tranh chap
trinh cac » trinh cau, trinh chat, trinh chao
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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: ho chieu tach - canh ((tranh cac) or (trinh cac)) thong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tach - canh ((tranh cac) OR (trinh cac)) thong cong dan toan cao*.