Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tien manh » tien anh, tien thanh, tieng anh
trinh van » trinh han, trinh quan, trinh toan
chinh can » chinh ca, chinh ban, chinh cau
hoc tien » hoc tieng, hoc hien, hoc vien
trinh va » trinh vat, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu

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 manh - hanh ((trinh va) OR (trinh van)) nhung cong dan ((phan cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - hanh ((trinh va) OR (trinh van)) nhung cong dan ((phan cau) OR (chinh can)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - hanh ((trinh va) OR (trinh van)) nhung cong dan ((phan cau) or (chinh can))".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - hanh ((trinh va) OR (trinh van)) nhung cong dan ((phan cau) or (chinh can))*.