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
trung tuan » trung thanh, trung tam, tran tuan
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan cau » 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 tuan dung cong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh trung tuan dung cong ban toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - thanh trung tuan dung cong ban toan cau*.