Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trung » hanh trang, manh trung, danh trung
chieu sang » chieu sach, chieu xanh, nhieu tang
trung cong » truong cong, trong cong, trung uong
hieu lang » hieu quang, nhieu tang, hieu van
cua trung » cua truong, xuan trung, cua nhung
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: hoc ((chieu sang) OR (hieu lang)) - ((hanh trung) or (thanh trung)) cua trung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - ((hanh trung) OR (thanh trung)) cua trung cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - ((hanh trung) or (thanh trung)) cua trung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - ((hanh trung) or (thanh trung)) cua trung cong tac toan cau*.