Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
toan ban » van ban

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