Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
chieu tu » chieu tro, lieu tu, chu tu
tu sach » su sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
hieu tu » hieu tuc, hien tu, lieu tu
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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