Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
trinh luan » trinh luat, trinh quan, trinh han
dang cong » dung cong
tinh cua » trinh cua, sinh cua, tinh chat
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

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