Perhaps you should try some spelling variations:
trinh cua » trinh luat, trinh quan, trinh luan
tong cong » trong cong, cong cong, dung cong
hoc chau » hoc chat, moc chau, hoc chan
tinh cua » sinh cua, tinh chat, tranh cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
hoc cau » hoc cao, hoc cac, hoc can

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chau) or (hoc cau)) tinh - hanh ((trinh cua) OR (tinh cua)) tong cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chau) OR (hoc cau)) tinh - hanh ((trinh cua) OR (tinh cua)) tong cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chau) or (hoc cau)) tinh - hanh ((trinh cua) OR (tinh cua)) tong cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chau) or (hoc cau)) tinh - hanh ((trinh cua) OR (tinh cua)) tong cong dan toan ban*.