Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thuong dan » huong dan, thuong han, thuong dam
hien hanh » dieu hanh
tang luan » dung luan
luan hang » luan nang, luan han, luan hung
anh tang » anh bang, anh dang, anh nang
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: theo ((((hien hanh) or (hieu nganh))) or (trieu tinh)) - anh tang luan hang thuong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((((hien hanh) OR (hieu nganh))) OR (trieu tinh)) - anh tang luan hang thuong dan phan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((((hien hanh) or (hieu nganh))) or (trieu tinh)) - anh tang luan hang thuong dan phan cau*.