Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
vu kham » vu khanh
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, xuc ban
vu cham » va cham, tu cham, qua cham
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
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: ((te sach) or (thu sach)) ky nang o hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang o hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky nang o hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang o hoi. hieu ((vu cham) OR (vu kham)) xuc van hanh di cua tre*.