Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
dong doanh » dung doanh, trong doanh, doanh doanh
trung cao » truong cao, trung cap, trung co
cao thanh » dao thanh, cho thanh, cac thanh
long doan » cong doan, rong doanh, dong don
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 ((thieu sach) or (thien hach)) - thanh trung cao thanh ((long doan) OR (dong doanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh trung cao thanh ((long doan) OR (dong doanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (thien hach)) - thanh trung cao thanh ((long doan) OR (dong doanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - thanh trung cao thanh ((long doan) OR (dong doanh)) toan tap*.