Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh quan » tinh quang, trinh luat
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh luat, trinh luan
cong san » cong tac
san toan » van toan, dan toan, manh toan
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: toc thieu sach - hanh ((trinh cua) or (((trinh quan) OR (trinh han)))) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - hanh ((trinh cua) OR (((trinh quan) OR (trinh han)))) nhung cong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sach - hanh ((trinh cua) or (((trinh quan) OR (trinh han)))) nhung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - hanh ((trinh cua) or (((trinh quan) OR (trinh han)))) nhung cong san toan cao*.