Perhaps you should try some spelling variations:
trinh tinh » trinh kinh, trinh tin, trinh dinh
doi trinh » doc trinh, doi tinh, dong trinh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
dinh cuu » dinh chi
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan cau » 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: doi trinh tinh - nhanh ((dinh cuu) or (trinh cua)) dung cong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi trinh tinh - nhanh ((dinh cuu) OR (trinh cua)) dung cong ban toan cau*.