Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
thong cong » trong cong, tong cong, thong thong
mot chieu » doi chieu
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, hoc thieu, doi chieu
anh tang » anh bang, anh dang, anh nang
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (ho chieu)) xanh - ((anh tang) or (nhanh mang)) cua thong cong bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (ho chieu)) xanh - ((anh tang) OR (nhanh mang)) cua thong cong bai toan tap.
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (ho chieu)) xanh - ((anh tang) or (nhanh mang)) cua thong cong bai toan tap*.