Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
phuong lan » phuong la, thuong lan, phuong linh
hieu cach » hieu cac, chieu sach, hieu ca
hoc hieu » hoc thieu, hoc hien, doc hieu
toan cau » 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 hieu cach - ((hanh trang) OR (hanh trinh)) va nhung ((phuong lan) or (phung van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((hanh trang) OR (hanh trinh)) va nhung ((phuong lan) OR (phung van)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - ((hanh trang) OR (hanh trinh)) va nhung ((phuong lan) or (phung van)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((hanh trang) OR (hanh trinh)) va nhung ((phuong lan) or (phung van)) toan cau*.