Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
mot trieu » mot chieu, mot tri, mon triet
tranh vat » trinh vat, tranh va, tranh van
vat thong » va thong, vat trong, mat thong
duong tac » tuong tac, duong tai, dong tac
ho trieu » 25 trieu, 30 trieu, ho chieu
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho trieu) OR (mot trieu)) tinh - canh tranh vat thong duong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho trieu) OR (mot trieu)) tinh - canh tranh vat thong duong tac toan cau*.