Perhaps you should try some spelling variations:
quan trong » gian trong
nhung chi » chung chi, nhung chu, nhung thi
quen vang » que van, que lang, quen hanh
biet quan » viet quan, bien quang, viet quang
trong ban » trong san, trong tan, trong quan
quan van » luan van, quan va, quan luan
ban hang » ngan hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((phung OR phuong) thi) or (nhung chi)) ((quen vang) or (quan van)). biet quan trong ban hang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((phung OR phuong) thi) OR (nhung chi)) ((quen vang) OR (quan van)). biet quan trong ban hang.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((phung OR phuong) thi) or (nhung chi)) ((quen vang) or (quan van)). biet quan trong ban hang".
• Adding a wildcard symbol may retrieve word variants: (((phung OR phuong) thi) or (nhung chi)) ((quen vang) or (quan van)). biet quan trong ban hang*.