Perhaps you should try some spelling variations:
kinh sach » dinh sach, tinh sach, chinh sach
sinh sach » chinh sach, sinh san, sang sach
truong va » truong dai, truong cao, truong dao
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((kinh sach) OR (sinh sach)) - thanh ((tung va) or (truong va)) hang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((kinh sach) OR (sinh sach)) - thanh ((tung va) OR (truong va)) hang cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((kinh sach) OR (sinh sach)) - thanh ((tung va) or (truong va)) hang cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((kinh sach) OR (sinh sach)) - thanh ((tung va) or (truong va)) hang cong dan toan cao*.