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