Perhaps you should try some spelling variations:
nhanh trang » nhanh thang, nhanh trong, thanh trang
hanh trang » thanh trung, canh tranh, hanh trinh
khong cang » thong cong, hong bang, thong cung
khong dung » thong dung, phuong dung, cuong dung
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
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: theo hieu lang - ((hanh trang) or (nhanh trang)) cua ((khong cang) OR (khong dung)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - ((hanh trang) OR (nhanh trang)) cua ((khong cang) OR (khong dung)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - ((hanh trang) or (nhanh trang)) cua ((khong cang) OR (khong dung)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - ((hanh trang) or (nhanh trang)) cua ((khong cang) OR (khong dung)) tac toan cau*.