Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu tinh » trieu tinh, chieu tinh, thien tinh
tien tinh » tien thinh, tien trinh, thien tinh
tranh cua » doanh cua, manh cua
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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: hoc ((thieu tinh) or (tien tinh)) - hanh ((tang cua) or (tranh cua)) thong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (tien tinh)) - hanh ((tang cua) OR (tranh cua)) thong cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) or (tien tinh)) - hanh ((tang cua) or (tranh cua)) thong cong dan toan cau*.