Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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