Perhaps you should try some spelling variations:
dung cong » dung trong
doc hieu » toc thieu, hoc thieu
tinh xay » trinh xay, trinh xac, tinh xach
tinh tay » kinh tay, tinh tai, tinh toan
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc hien)) nganh - canh ((tinh xay) OR (tinh tay)) dung cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) nganh - canh ((tinh xay) OR (tinh tay)) dung cong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc hien)) nganh - canh ((tinh xay) OR (tinh tay)) dung cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) nganh - canh ((tinh xay) OR (tinh tay)) dung cong dan phan cau*.