Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tieu sang » chieu sang, tieu dung, tiem nang
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan

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)) thong cong dan thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - hanh ((trang va) OR (tran van)) thong cong dan thanh cac.
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - hanh ((trang va) or (tran van)) thong cong dan thanh cac*.