Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
tran manh » tran minh, tran thanh, tran dinh
hung cong » nhung cong, hung cuong, phung cong
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: toc thieu sach - hanh ((tran manh) OR (tran van)) hung cong dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sach - hanh ((tran manh) OR (tran van)) hung cong dan toan tap".
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - hanh ((tran manh) OR (tran van)) hung cong dan toan tap*.