Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » canh tranh, hanh trinh, minh trang
doi chieu » doc hieu, doi chi, ho chieu
dung manh » duong manh, dung danh, hung manh
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
trung » trcung
ung » cung
dung » dcung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - ((hanh trang) or (thanh trung)) va ung dung manh ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh trang) OR (thanh trung)) va ung dung manh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh trang) or (thanh trung)) va ung dung manh ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh trang) or (thanh trung)) va ung dung manh ((toan cau) OR (toan cao))*.