Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh quan, trinh luan
dung cong » dung trong
cong van » cong vang, cong san, song van
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trinh cua) OR (trinh luat)) dung cong van ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((trinh cua) OR (trinh luat)) dung cong van ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh cua) OR (trinh luat)) dung cong van ((toan cau) or (toan ban))*.