Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
mot chieu » doi chieu, ho chieu
canh hang » tranh hang, cang thang, danh thang
cong thuc » cong tac
doc hieu » toc thieu, hoc thieu, hoc hien
va thong » va thuong, va phuong, he thong
pham cau » phan cau, pham ca, pham can

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 (doc hieu)) xanh - canh hang va thong cong thuc pham cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doc hieu)) xanh - canh hang va thong cong thuc pham cau.
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doc hieu)) xanh - canh hang va thong cong thuc pham cau*.