Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
doi chiet » doi chieu, doi chi, doi viet
van phan » van phong, van thanh, luan phan
phan cac » nhan cach, phan dau, phan lap
manh va » hanh va, anh va, minh va
sinh va » sinh vat, tinh va, dinh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - lanh ((manh va) or (sinh va)) ((nhung cong) or (thong cong)) van phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - lanh ((manh va) OR (sinh va)) ((nhung cong) OR (thong cong)) van phan cac.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - lanh ((manh va) or (sinh va)) ((nhung cong) or (thong cong)) van phan cac*.