Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
thong cong » trong cong, tong cong, thong thong
hieu sang » chieu sang, hieu lang, hieu quang
doc hieu » toc thieu, hoc thieu, hoc hien
thang va » hang va, trang va, thong va
va thong » va thuong, va phuong, he thong
cong van » cong vang, cong san, song van
phan van » pham van, thanh van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - thanh thang va thong cong van ((phan tu) or (phan van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh thang va thong cong van ((phan tu) OR (phan van))*.