Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
khien tinh » thien tinh, khien thich, bien tinh
hoc khien » hoc hien, hoc nghien, hoc thieu
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
van nhung » van nhuong, va nhung, van hung
cong hach » cong sach, cong thanh, cong khanh
toan cao » toan ban
toan tap » toan ban

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 - ((hanh tran) OR (hanh tram)) van nhung cong hach ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc khien tinh - ((hanh tran) or (hanh tram)) van nhung cong hach ((toan cao) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc khien tinh - ((hanh tran) or (hanh tram)) van nhung cong hach ((toan cao) OR (toan tap))*.