Perhaps you should try some spelling variations:
dung thuong » dung trong, hang thuong, cong thuong
thuong dan » huong dan, thuong han, thuong dam
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
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: hoc hieu manh - hanh ((dung luan) or (trinh luat)) dung thuong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh ((dung luan) OR (trinh luat)) dung thuong dan phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((dung luan) or (trinh luat)) dung thuong dan phan cau*.