Perhaps you should try some spelling variations:
cong ngang » cong nhan, cong quang, cong lang
ngang toan » nganh toan, dang toan, quang toan
trinh cua » trinh luat, trinh quan, trinh luan
dung cong » dung trong
thi hieu » thi chieu, thi hien, thi dieu
chao chu » cho chu, cua chu, cao cho
tinh cua » sinh cua, tinh chat, tranh cua
toan cao » toan ban, toan tap

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: ((thi hieu) OR (chao chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong ngang toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thi hieu) or (chao chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong ngang toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((thi hieu) or (chao chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong ngang toan cao*.