Perhaps you should try some spelling variations:
luat thong » luat thuong, suat thong, xuat thong
luan thong » luan phong, luan tuong, xuan thong
hieu manh » chieu xanh, hieu nganh, hien hanh
hanh tang » hanh trang, anh tang, hanh mang
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 manh) OR (dieu hanh)) - hanh tang ((luan thong) or (luat thong)) cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (dieu hanh)) - hanh tang ((luan thong) OR (luat thong)) cong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (dieu hanh)) - hanh tang ((luan thong) or (luat thong)) cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (dieu hanh)) - hanh tang ((luan thong) or (luat thong)) cong dan phan cau*.