Perhaps you should try some spelling variations:
duy sang » duy van, duy can, duy anh
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ((((ky sang) OR (duy sang))) or (ky tang)) xa hoi. hieu ve cam xuc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((ky sang) OR (duy sang))) OR (ky tang)) xa hoi. hieu ve cam xuc van hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((((ky sang) OR (duy sang))) or (ky tang)) xa hoi. hieu ve cam xuc van hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((((ky sang) OR (duy sang))) or (ky tang)) xa hoi. hieu ve cam xuc van hanh lai cua tre*.