Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
xuong dan » huong dan, xuong san, tuong dan
trung dai » truong dai, truong dao, trung tam
tung dan » dung dan, huong dan, dung dat
toan cao » toan ban, toan tap
co lieu » cot lieu, co hieu, so lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co lieu tinh - canh tranh cua nhung ((xuong dan) or (((tung dan) OR (trung dai)))) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co lieu tinh - canh tranh cua nhung ((xuong dan) OR (((tung dan) OR (trung dai)))) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co lieu tinh - canh tranh cua nhung ((xuong dan) or (((tung dan) OR (trung dai)))) toan cao".
• Adding a wildcard symbol may retrieve word variants: co lieu tinh - canh tranh cua nhung ((xuong dan) or (((tung dan) OR (trung dai)))) toan cao*.