Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
tranh van » tran van, thanh van, tranh ban
trinh van » trinh han, trinh quan, trinh toan
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - canh ((tranh van) or (trinh van)) thong cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - canh ((tranh van) OR (trinh van)) thong cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - canh ((tranh van) or (trinh van)) thong cong dan chan cau*.