Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trang » thanh trung, hanh trinh, minh trang
hoc hieu » hoc thieu, hoc hien, hoc dieu
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu

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) or (doc hieu)) cach - ((hanh trang) OR (canh tranh)) va nhung cong san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (doc hieu)) cach - ((hanh trang) OR (canh tranh)) va nhung cong san phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (doc hieu)) cach - ((hanh trang) OR (canh tranh)) va nhung cong san phan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (doc hieu)) cach - ((hanh trang) OR (canh tranh)) va nhung cong san phan cau*.