Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
cau truong » cao truong, xa truong, cau duong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
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 hieu tinh - hanh trang ((cac truong) or (cau truong)) cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh trang ((cac truong) OR (cau truong)) cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh trang ((cac truong) or (cau truong)) cong dan chan cau*.