Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh hang » thanh hang, hang hang, hanh han
cua thong » cua thuong, cua khong, cua tong
thong tap » thong cap, tong tap, thong tai
hang cua » mang cua, hang ca, huong cua
tap toan » tap doan, tap quan, bai 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 xanh) or (thien thanh)) - hanh hang cua thong thong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (thien thanh)) - hanh hang cua thong thong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (thien thanh)) - hanh hang cua thong thong tap toan cau*.