Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
thanh toan » thanh hoa, thanh san, tinh toan
trinh cua » tinh cua, trinh luat, trinh luan
manh toan » anh tuan, tinh toan

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