Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu sang » chieu sang, hieu lang, hieu quang
chinh cua » chinh sua, hinh cua, chinh luan
cong tuan » cong tan, cong luan, cong thanh
doc hieu » toc thieu, hoc thieu, hoc hien
chinh ca » chinh va, chinh tai, chinh cho
chinh ta » chinh tai, chinh va, chinh tri
tuan van » luan van, tran van, tan 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 - hanh ((chinh cua) or (((chinh ca) or (chinh ta)))) nhung cong tuan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh ((chinh cua) OR (((chinh ca) OR (chinh ta)))) nhung cong tuan van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh ((chinh cua) or (((chinh ca) or (chinh ta)))) nhung cong tuan van ban*.