Perhaps you should try some spelling variations:
thang trong » thong trong, than trong, khoang trong
cong thang » cong thanh, cang thang, cong thong
trong dang » truong dang, trong dan, trong dong
phan cong » thanh cong
doc hieu » hoc thieu, hoc hien
dang van » hoang van, hang va
van van » tan van, san van, van vat

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) or (toc thieu)) tinh - phan cong thang trong dang van van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - phan cong thang trong dang van van ban.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - phan cong thang trong dang van van ban*.