Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
dang cong » dung cong
hang nong » thang long, han tong
chi xanh » chi anh, chi danh, chi hanh
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - hanh trinh cua ((dang cong) or (hang nong)) tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - hanh trinh cua ((dang cong) OR (hang nong)) tap toan cao.
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh trinh cua ((dang cong) or (hang nong)) tap toan cao*.