Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
doanh cua » doanh luan
hang cong » dang cong, hang nong, bang cong
dan thanh » dang thanh, danh thanh, ban thanh
manh cua » ban cua
cong dan » cong san, cong tan, huong dan
thanh tu » hanh tu, nhanh tu, thanh tung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien nhanh) OR (tien thanh)) - hanh ((manh cua) or (doanh cua)) hang cong dan thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - hanh ((manh cua) OR (doanh cua)) hang cong dan thanh tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) OR (tien thanh)) - hanh ((manh cua) or (doanh cua)) hang cong dan thanh tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) OR (tien thanh)) - hanh ((manh cua) or (doanh cua)) hang cong dan thanh tu*.