Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hien nhanh » hien hanh, tien thanh, dien thanh
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
trong bai » trong ban, thong bai, trong hai
cua dung » cua dang, cua dong, qua dung
bai toan » bai tap
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 nhanh) or (thien thanh)) - hanh trang cua dung trong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - hanh trang cua dung trong bai toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (thien thanh)) - hanh trang cua dung trong bai toan cau*.