Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trang » canh tranh, hanh trinh, minh trang
hieu sach » chieu sach, dien sach, hieu cac
hieu cach » hieu cac, chieu sach, hieu ca
dung manh » duong manh, dung danh, hung manh
manh toan » thanh toan, anh tuan, tinh toan
toan cau » 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: doc ((hieu sach) OR (hieu cach)) - ((hanh trang) or (thanh trung)) va ung dung manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cach)) - ((hanh trang) OR (thanh trung)) va ung dung manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) OR (hieu cach)) - ((hanh trang) or (thanh trung)) va ung dung manh toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) OR (hieu cach)) - ((hanh trang) or (thanh trung)) va ung dung manh toan cau*.