Perhaps you should try some spelling variations:
nguoi dung » nguoi nung, noi dung, nguoi dan
nuoi duong » noi dung, boi duong, nuoi trong
quen vang » quan van, que van, que lang
nhung bi » nhung bai, nhung gi
bi quen » bi quyet, bi quang, si quyen
hoc mot » hoc moi
hoc mo » hoc moi, hoc mon, hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: nhung bi quen vang. ((((nuoi duong) or (nguoi dung))) or (nguoi muong)) ((hoc mo) OR (hoc mot))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhung bi quen vang. ((((nuoi duong) OR (nguoi dung))) OR (nguoi muong)) ((hoc mo) OR (hoc mot)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhung bi quen vang. ((((nuoi duong) or (nguoi dung))) or (nguoi muong)) ((hoc mo) OR (hoc mot))".
• Adding a wildcard symbol may retrieve word variants: nhung bi quen vang. ((((nuoi duong) or (nguoi dung))) or (nguoi muong)) ((hoc mo) OR (hoc mot))*.