Perhaps you should try some spelling variations:
cong chong » cong cong, cong thong, cong chung
chong phap » phuong phap
doi chieu » doc hieu, doi chi, mot chieu
trinh cua » trinh luat, trinh quan, trinh luan
phap toan » phap hoan, phap luan, phap phan
ho chieu » theo chieu, hoc thieu, mot chieu
tinh cua » sinh cua, tinh chat, tranh cua
toan ban » van ban

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 chieu)) tinh - hanh ((trinh cua) or (tinh cua)) cong chong phap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) tinh - hanh ((trinh cua) OR (tinh cua)) cong chong phap toan ban.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) tinh - hanh ((trinh cua) or (tinh cua)) cong chong phap toan ban*.