Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
manh trung » manh tung, thanh trung, manh hung
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
dan than » dan chan, ban than, van than
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - manh trung cua ((hang cong) or (han tong)) ((dan than) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - manh trung cua ((hang cong) OR (han tong)) ((dan than) OR (van tan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - manh trung cua ((hang cong) or (han tong)) ((dan than) or (van tan)) cao*.