Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: theo ((hieu lang) or (dieu hanh)) - hanh manh ((cua dung) OR (qua dung)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (dieu hanh)) - hanh manh ((cua dung) OR (qua dung)) cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (dieu hanh)) - hanh manh ((cua dung) OR (qua dung)) cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (dieu hanh)) - hanh manh ((cua dung) OR (qua dung)) cong tan toan cau*.