Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trang » thanh trung, hanh trinh, minh trang
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
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 trang) or (canh tranh)) cua nhung cong tan ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - ((hanh trang) OR (canh tranh)) cua nhung cong tan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu sach - ((hanh trang) or (canh tranh)) cua nhung cong tan ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - ((hanh trang) or (canh tranh)) cua nhung cong tan ((toan cau) OR (toan cao))*.