Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
dung cong » dung trong
doi lieu » duoc lieu, doi chieu, du lieu
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san phan » san pham, van phan, sat phan
phan dau » phan tu, hang dau
luan » quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi lieu tinh - lan ((tranh va) or (luan van)) dung cong san phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi lieu tinh - lan ((tranh va) OR (luan van)) dung cong san phan dau.
• Adding a wildcard symbol may retrieve word variants: doi lieu tinh - lan ((tranh va) or (luan van)) dung cong san phan dau*.