Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh luc » thanh luu, than luc, nhan luc
thu sach » thuat sach, thuoc sach, thu hoach
sang tao » hang tai
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
sang ma » tang ma, nang ma, mang may
tu sach » su sach, te sach, tu cach
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: ((thu sach) OR (tu sach)) 2 ((sang ma) or (sang tao)) hoi. hieu van thanh luc va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) 2 ((sang ma) OR (sang tao)) hoi. hieu van thanh luc va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) 2 ((sang ma) or (sang tao)) hoi. hieu van thanh luc va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) 2 ((sang ma) or (sang tao)) hoi. hieu van thanh luc va hanh lai cua te*.