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