Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
toan luong » toan uong, toan thuong, tien luong
luong cong » dung cong, trong cong, cong cong
hanh tinh » nhanh tinh, thanh tinh, canh tinh
ho chieu » theo chieu, hoc thieu, doi chieu
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan ban » van ban
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: ((ho chieu) or (doi chi)) xanh - ((hanh tinh) OR (hanh trinh)) toan luong cong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) xanh - ((hanh tinh) OR (hanh trinh)) toan luong cong bai toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chi)) xanh - ((hanh tinh) OR (hanh trinh)) toan luong cong bai toan ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) xanh - ((hanh tinh) OR (hanh trinh)) toan luong cong bai toan ban*.