Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
anh tang » anh bang, anh nang, anh tong
anh sang » lanh sang, anh bang, anh nang
anh dang » anh dong, anh dung, anh bang
va trong » va truong, va thong, va tuong
cong san » cong tac
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu tinh - ((anh tang) or (((anh sang) or (anh dang)))) va trong cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu tinh - ((anh tang) OR (((anh sang) OR (anh dang)))) va trong cong san van ban.
• Adding a wildcard symbol may retrieve word variants: toc thieu tinh - ((anh tang) or (((anh sang) or (anh dang)))) va trong cong san van ban*.