Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hanh trung » thanh trung, manh trung, danh trung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
hach toan » thanh toan
manh toan » thanh toan, anh tuan, tinh toan
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 lang - ((hanh trung) or (hanh trang)) cua nhung cong ((hach toan) OR (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((hanh trung) OR (hanh trang)) cua nhung cong ((hach toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - ((hanh trung) or (hanh trang)) cua nhung cong ((hach toan) OR (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((hanh trung) or (hanh trang)) cua nhung cong ((hach toan) OR (manh toan)) cao*.