Perhaps you should try some spelling variations:
trinh cua » trinh luat, trinh quan, trinh luan
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
lang toan » dang toan, lang thang, lang thanh
ho chieu » theo chieu, hoc thieu, doi chieu
theo chu » theo chieu, cho chu, chao chu
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (theo chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong lang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong lang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong lang toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chu)) tinh - hanh ((trinh cua) OR (tinh cua)) dung cong lang toan cao*.