Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, hanh trang, nhanh lang
cua thong » cua thuong, cua khong, cua tong
cuu nong » cuu cong, cuu nang, cuu tong
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 mang ((cua thong) or (cuu nong)) cong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh mang ((cua thong) OR (cuu nong)) cong trinh toan cau.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh mang ((cua thong) or (cuu nong)) cong trinh toan cau*.