Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
chu sach » cau sach, thu sach, chuc hach
tung tai » trung tai, dung tai, tang tai
dong van » duong van, dong von, dong va
dang van » hoang van, hang va
toan cao » toan ban, toan tap
tai sao » tai san

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu sach) OR (chieu sach)) - thanh tung tai sao ((dong van) or (dang van)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sach) OR (chieu sach)) - thanh tung tai sao ((dong van) OR (dang van)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sach) OR (chieu sach)) - thanh tung tai sao ((dong van) or (dang van)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sach) OR (chieu sach)) - thanh tung tai sao ((dong van) or (dang van)) toan cao*.