Perhaps you should try some spelling variations:
trien quang » tran quang, tuyen quang, dien quang
thieu tang » nhieu tang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hanh hang » thanh hang, hang hang, hanh han
cong ban » cong bang, cong san, cong tan
ban hanh » ban hang
hanh cac » hang cac, hanh cat, nhanh cay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tang) or (trien quang)) - hanh hang va nhung cong ban hanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tang) OR (trien quang)) - hanh hang va nhung cong ban hanh cac.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tang) or (trien quang)) - hanh hang va nhung cong ban hanh cac*.