Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh xay » trinh ky
dung cong » dung trong
hoc hieu » hoc thieu, doc hieu, hoc dieu
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: ((hoc hieu) OR (hoc hien)) nganh - canh trinh xay dung cong dan phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) OR (hoc hien)) nganh - canh trinh xay dung cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) OR (hoc hien)) nganh - canh trinh xay dung cong dan phan cau*.