Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
trung vat » trung va, trong vat, truong van
trung van » truong van, trong van, trung va
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
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 ((hien nhanh) or (tien thanh)) - hanh ((trung vat) OR (trung van)) dung cong dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - hanh ((trung vat) OR (trung van)) dung cong dan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (tien thanh)) - hanh ((trung vat) OR (trung van)) dung cong dan phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (tien thanh)) - hanh ((trung vat) OR (trung van)) dung cong dan phan dau*.