Perhaps you should try some spelling variations:
nhung tung » nhung tuong, nhung dung, nhung vung
hanh trang » thanh trung, canh tranh, hanh trinh
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
trang cua » tranh cua, tang cua, trung cua
cua nhung » va nhung
tung dan » dung dan, huong dan, trung dai
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: hoc ((hien sach) OR (kien sach)) - hanh trang cua nhung tung dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh trang cua nhung tung dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (kien sach)) - hanh trang cua nhung tung dan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (kien sach)) - hanh trang cua nhung tung dan ((toan cau) or (toan cao))*.