Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tien tinh » tien thinh, tien trinh, thien tinh
trinh van » trinh quan, trinh toan, dinh van
trinh han » trinh quan
hoc tien » hoc tieng, hoc hien, hoc vien
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
phan dau » phan tu, hang dau

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

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