Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
thong cong » trong cong, tong cong, thong thong
trinh cua » tinh cua, trinh luat, trinh luan
ho chieu » theo chieu, hoc thieu, doi chieu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
doi chi » doi khi

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