Perhaps you should try some spelling variations:
doi lang » hoi lang, doi khang, doi song
hanh vai » hanh vi, hanh va, hanh tai
doi mang » do mang, doi khang, doi song
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
van cau » van dau, van hau, van chat
va cau » va cac, va dau, va cao
luc va » duc va, tuc va, loc va
cua te » cua tu

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 ((doi lang) OR (doi mang)) xa hoi. hieu ((va cau) or (van cau)) luc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((doi lang) OR (doi mang)) xa hoi. hieu ((va cau) OR (van cau)) luc va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((doi lang) OR (doi mang)) xa hoi. hieu ((va cau) or (van cau)) luc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((doi lang) OR (doi mang)) xa hoi. hieu ((va cau) or (van cau)) luc va hanh vai cua te*.