Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
tung hoc » trung hoc, tuong hoc, tung ho
dung hoc » dong hoc, dung thuoc, trung hoc
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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: ((ho chieu) OR (doi chieu)) xanh - thanh ((tung hoc) OR (dung hoc)) nhung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) xanh - thanh ((tung hoc) or (dung hoc)) nhung cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) xanh - thanh ((tung hoc) or (dung hoc)) nhung cong dan toan cao*.