Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
chat duc » chat xuc, chat doc, chet duoc
tu sach » thu sach, te sach, tu cach
duc gia » quoc gia
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
mo hoi » mo phoi, mo hoc, co hoi
ro hoi » co hoi, o hoi, ro doi
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) or (su sach)) ky nang ((ro hoi) OR (mo hoi)). lieu va chat duc gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((ro hoi) OR (mo hoi)). lieu va chat duc gia thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ((ro hoi) OR (mo hoi)). lieu va chat duc gia thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((ro hoi) OR (mo hoi)). lieu va chat duc gia thanh vi cua tre*.