Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » tuc va, xac va
luc va » tuc va, loc va
di cua » dai cua, doi cua, de 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 y nang ma hoi. hieu va cac ((((xuc va) or (luc va))) or (duc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu va cac ((((xuc va) OR (luc va))) OR (duc va)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu va cac ((((xuc va) or (luc va))) or (duc va)) hanh di cua tre*.