Perhaps you should try some spelling variations:
dong tuong » dong thuong, dong thong, dong trong
hien sang » hien trang, khien bang, chieu sang
lanh manh » lanh tranh, lan anh, van manh
hanh mang » nhanh mang, hanh trang, nhanh lang
tuong tac » cong tac, luong tai, tuong lai
cua dong » chua dong, cua cong, cua dang
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 hien sang - ((lanh manh) or (hanh mang)) cua dong tuong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - ((lanh manh) OR (hanh mang)) cua dong tuong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - ((lanh manh) or (hanh mang)) cua dong tuong tac toan cau*.