Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tang cong » tang cuong, trang cong, dang cong
doc hieu » hoc thieu, hoc hien
trinh ha » trinh han, trinh hoa, trinh nha
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
ha tang » phap tang, cao tang, kho tang

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 (toc thieu)) xanh - hanh trinh ha tang cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) xanh - hanh trinh ha tang cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) xanh - hanh trinh ha tang cong dan than cau*.