Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
hieu lang » chieu sang, hieu quang, nhieu tang
hieu cach » hieu cac, chieu sach, hieu ca
tuan bang » tuan dang, tuan hoang, thuat bang
bang cong » dang cong, bang song, hang cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: doi ((((hieu lang) or (hieu cach))) or (chiet tach)) - thanh trung tuan bang cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((((hieu lang) OR (hieu cach))) OR (chiet tach)) - thanh trung tuan bang cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((((hieu lang) or (hieu cach))) or (chiet tach)) - thanh trung tuan bang cong tac toan cau*.