Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
trinh quan » tinh quang, trinh han
nhung cong » dung cong, thong cong, hang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
luat » luan, xuat

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