Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
doan van » doan va, hoang van, luan van
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac cua » cach cua, cac qua, ca cua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y lang xa hoi. hieu ve cac cua ban ((danh vai) or (doan van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. hieu ve cac cua ban ((danh vai) OR (doan van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu ve cac cua ban ((danh vai) or (doan van)) cua tre*.