Perhaps you should try some spelling variations:
khien tinh » thien tinh, khien thich, bien tinh
nhung cong » dung cong, thong cong, hang cong
hoc khien » hoc hien, hoc nghien, hoc thieu
trung vap » trung va, trung van, trung lap
trung cap » truong cao, trung tam
cong dan » cong san, cong tan, huong dan
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien tinh - thanh ((trung vap) OR (trung cap)) nhung cong dan ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc khien tinh - thanh ((trung vap) OR (trung cap)) nhung cong dan ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc khien tinh - thanh ((trung vap) OR (trung cap)) nhung cong dan ((phan cau) or (phan dau))*.