Perhaps you should try some spelling variations:
thong chong » thong chuong, thong thong, phong chong
trinh quan » tinh quang, trinh luat, trinh han
chong phap » phuong phap
trinh cua » tinh cua, trinh luat, trinh luan
phap toan » phap hoan, phap luan, phap phan
theo chu » theo chieu, chao chu, theo yeu
toan ban » van ban
cho chu » cho thue

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chu) OR (cho chu)) xanh - hanh ((trinh cua) OR (trinh quan)) thong chong phap toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) or (cho chu)) xanh - hanh ((trinh cua) OR (trinh quan)) thong chong phap toan ban~".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) or (cho chu)) xanh - hanh ((trinh cua) OR (trinh quan)) thong chong phap toan ban*.