Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
hiem ngan » kim ngan, viem gan
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
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 ((hiem ngan) or (hieu lang)) - hanh tang ((cua nhung) OR (va nhung)) cong thanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hiem ngan) OR (hieu lang)) - hanh tang ((cua nhung) OR (va nhung)) cong thanh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hiem ngan) or (hieu lang)) - hanh tang ((cua nhung) OR (va nhung)) cong thanh toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hiem ngan) or (hieu lang)) - hanh tang ((cua nhung) OR (va nhung)) cong thanh toan cau*.