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
cong tinh » cong trinh, long tinh, cong thanh
cong vinh » cong trinh, trong vinh, cong viec
trung va » truong va, trang va, trung ha
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: hoc ((thieu sach) or (thien hach)) - thanh trung va nhung ((cong tinh) OR (cong vinh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh trung va nhung ((cong tinh) OR (cong vinh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (thien hach)) - thanh trung va nhung ((cong tinh) OR (cong vinh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - thanh trung va nhung ((cong tinh) OR (cong vinh)) toan cao*.