Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, hang cong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
trang va » hang va
tran van » luan van
toan cao » toan ban, toan tap

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 - thanh ((trang va) OR (tran van)) nhung cong vang toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sach - thanh ((trang va) OR (tran van)) nhung cong vang toan cao*".