Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
chat huu » pham huu
chat tuc » chat xuc, luat tuc, chat cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ro hoi » co hoi, mo hoi, ro doi
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 ky nang ((ro hoi) or (o hoi)). lieu va ((chat tuc) OR (chat huu)) gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ro hoi) OR (o hoi)). lieu va ((chat tuc) OR (chat huu)) gia thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ro hoi) or (o hoi)). lieu va ((chat tuc) OR (chat huu)) gia thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ro hoi) or (o hoi)). lieu va ((chat tuc) OR (chat huu)) gia thanh vi cua tre*.