Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
vua thong » suat thong, xuat thong, cua thuong
thong dam » thuong dam, thong nam, trong dam
ho chieu » theo chieu, hoc thieu, doi chieu
va thong » va thuong, va phuong, he thong
dam toan » dan toan, tam toan, dam thanh
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (ho chieu)) tinh - nhanh mang ((vua thong) OR (va thong)) thong dam toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (ho chieu)) tinh - nhanh mang ((vua thong) OR (va thong)) thong dam toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (ho chieu)) tinh - nhanh mang ((vua thong) OR (va thong)) thong dam toan cau*.