Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
canh trinh » canh tranh, hanh trinh, canh tinh
luan chinh » luan chi, hoan chinh, luat hinh
hoc thieu » toc thieu, hoc hien
cong san » cong tac
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - canh trinh ((luan chung) OR (luan chinh)) cong san ((toan tai) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - canh trinh ((luan chung) OR (luan chinh)) cong san ((toan tai) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh trinh ((luan chung) OR (luan chinh)) cong san ((toan tai) or (toan ban))*.