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
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, xuan toan

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) OR (manh 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) OR (manh toan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tach - canh ((tranh cac) or (trinh cac)) thong cong ((dan toan) OR (manh toan)) cao*".