Perhaps you should try some spelling variations:
nguong dan » huong dan
nhung cong » dung cong, thong cong, hang cong
toan thanh » tran thanh, hoan thanh, toan thang
doi chieu » doc hieu, doi chi, mot chieu
tuong dan » huong dan, tung dan, xuong dan
cong toan » cong tan, cong hoan, cong tuan
thanh lap » thanh san, phan lap, thanh hai
ho chieu » theo chieu, hoc thieu, mot chieu

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