Perhaps you should try some spelling variations:
pham truong » pham thuong, pham trong, pham trung
cam truong » cac truong, lam truong, cao truong
doc lieu » duoc lieu, du lieu, so lieu
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

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