Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hien sach » dien sach, kien sach, thien hach
dung cong » dung trong
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (thien thanh)) - hanh ((trang va) or (tran van)) dung cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien thanh)) - hanh ((trang va) OR (tran van)) dung cong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien thanh)) - hanh ((trang va) or (tran van)) dung cong dan toan tap*.