Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
quan chuan » quan chuyen, quan luan, quan cua
chuan chau » chuan chat, chuan ha, chua chay
hieu cach » hieu cac, chieu sach, hieu ca
va phuong » va thuong, cac phuong
cong quan » cuong quan, cong quang, tong quan
hoc hieu » hoc thieu, hoc hien, doc hieu

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 phuong cong quan chuan chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((hanh trang) OR (hanh trinh)) va phuong cong quan chuan chau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((hanh trang) or (hanh trinh)) va phuong cong quan chuan chau*.