Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tran tuan » tran quang, tran thanh, tranh luan
tran xuan » tran quang, tran van
yen tinh » tuyen tinh
cong dan » cong san, cong tan, huong dan
toan ban » van ban
toan cao » toan tap
hoc yen » hoc quyen, hoc tuyen, hoc hien

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

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