Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu tuc » hieu thuc, hieu luc, hieu thuoc
tuc cham » toc cham, tu cham, phuc cham
cham tuc » nham thuc, pham thuc, tham thuc
tu sach » su sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de 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 tuc cham tuc va hanh di 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 tuc cham tuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang o hoi. hieu tuc cham tuc va hanh di cua tre*.