Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
hieu lang » chieu sang, hieu quang, nhieu tang
tuong dan » huong dan, tung dan, xuong dan
doi hieu » doi chieu, doc hieu, doi hien
ung cong » dung cong, luong cong, duong cong
cong van » cong vang, cong san, song van
toan cau » toan cao, toan ban, toan tap
dan ung » dan dung, dan vung, dang ung
tan cau » van cau, tao cau, ban cau
tan ca » tan cua, tang ca, dan ca

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - thanh tuong dan ung cong van ((((tan cau) OR (toan cau))) or (tan ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh tuong dan ung cong van ((((tan cau) OR (toan cau))) OR (tan ca)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - thanh tuong dan ung cong van ((((tan cau) OR (toan cau))) or (tan ca))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh tuong dan ung cong van ((((tan cau) OR (toan cau))) or (tan ca))*.