Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
van lam » van nam
van hoc » van hoa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky nang van hoc. hieu van lam ((xuc va) OR (luc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang van hoc. hieu van lam ((xuc va) OR (luc va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ky nang van hoc. hieu van lam ((xuc va) OR (luc va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang van hoc. hieu van lam ((xuc va) OR (luc va)) hanh vai cua tre*.