Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cua hang » cua dang, cua cong, cua dan
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 lang - hanh hang ((((cua hang) OR (cua nhung))) or (cua ban)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh hang ((((cua hang) OR (cua nhung))) OR (cua ban)) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh hang ((((cua hang) OR (cua nhung))) or (cua ban)) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh hang ((((cua hang) OR (cua nhung))) or (cua ban)) cong tac toan cau*.