Perhaps you should try some spelling variations:
thanh trung » thanh tung
lang trong » cong trong, dong trong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung cua ((dung trong) or (lang trong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung cua ((dung trong) OR (lang trong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung cua ((dung trong) or (lang trong)) tac toan cau*.