Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
doi lang » hoi lang, doi mang, doi khang
van chat » cao chat
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, toan cau
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
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 xa hoi. hieu ((va cau) or (((van cau) OR (van chat)))) luc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi lang xa hoi. hieu ((va cau) OR (((van cau) OR (van chat)))) luc va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach doi lang xa hoi. hieu ((va cau) or (((van cau) OR (van chat)))) luc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach doi lang xa hoi. hieu ((va cau) or (((van cau) OR (van chat)))) luc va hanh vai cua te*.