Perhaps you should try some spelling variations:
thi hanh » thi thanh
hanh cam » hanh cham, hanh lam, hanh nam
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: tu sach y nang xa hoi. thi hanh cam ((((xuc va) OR (luc va))) or (thuc vat)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. thi hanh cam ((((xuc va) OR (luc va))) OR (thuc vat)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. thi hanh cam ((((xuc va) OR (luc va))) or (thuc vat)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. thi hanh cam ((((xuc va) OR (luc va))) or (thuc vat)) hanh vai cua tre*.