Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu sang » chieu sang, tieu dung, tiem nang
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan hanh » dang hanh, dan khanh, dan thanh
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: theo tieu sang - hanh ((trang va) or (tran van)) nhung cong dan hanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - hanh ((trang va) OR (tran van)) nhung cong dan hanh cac.
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - hanh ((trang va) or (tran van)) nhung cong dan hanh cac*.