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