Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
dai luong » dai cuong, dai duong, do luong
thanh can » thanh san, thanh van, thanh tan
dan dung » van dung, tin dung, ap dung
can cau » van cau, ban cau, ca cau

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 - thanh trung ((dan dung) or (dai luong)) cong thanh can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh trung ((dan dung) OR (dai luong)) cong thanh can cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh trung ((dan dung) or (dai luong)) cong thanh can cau*.