Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tuong dan » huong dan, xuong dan, truong dai
doc hieu » toc thieu, hoc thieu, hoc hien
tung dan » dung dan, huong dan, trung dai
than cau » toan cau, phan cau, than cap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - canh tranh cua nhung ((tuong dan) OR (tung dan)) than cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - canh tranh cua nhung ((tuong dan) OR (tung dan)) than cau*.