Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
thong cong » trong cong, tong cong, thong thong
nang van » dang van, tang van, nong van
lang van » dang van, tang van, hoang van
cong san » cong tac
san tran » tan tran, ban tran, dang tran
tran tap » toan tap, tran tan, tran tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) OR (chiet tach)) - anh ((nang van) or (lang van)) thong cong san tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - anh ((nang van) OR (lang van)) thong cong san tran tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chiet tach)) - anh ((nang van) or (lang van)) thong cong san tran tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chiet tach)) - anh ((nang van) or (lang van)) thong cong san tran tap*.