Perhaps you should try some spelling variations:
trinh tinh » trinh kinh, trinh tin, trinh dinh
doanh luan » doanh nhan
doi trinh » doc trinh, doi tinh, dong trinh
tranh cua » doanh cua, manh cua
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
nhan tai » hang tai, van tai, toan tai
han tap » han tai, toan tap, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi trinh tinh - hanh ((tranh cua) or (doanh luan)) dung cong tan ((han tap) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi trinh tinh - hanh ((tranh cua) OR (doanh luan)) dung cong tan ((han tap) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: doi trinh tinh - hanh ((tranh cua) or (doanh luan)) dung cong tan ((han tap) or (nhan tai))*.