Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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 nang cao hoi. hieu va cac ((((xuc va) or (xac va))) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu va cac ((((xuc va) OR (xac va))) OR (tuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu va cac ((((xuc va) or (xac va))) or (tuc va)) hanh vi cua tre*.