Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ty nang » ty hang, ly nang, ty nong
hieu va » lieu va, hieu qua
dao cua » dai cua, day cua, dan cua
cua tre » cua te, cuu tre, cua triet
va dat » va dao, va dau, va dap
o hoi » co hoi, o hoc, o hai
nuoc » quoc, duoc, ngoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((((ty nang) OR (ty xang))) or (ky nang)) o hoi. hieu va dat nuoc va van dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((((ty nang) OR (ty xang))) OR (ky nang)) o hoi. hieu va dat nuoc va van dao cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((((ty nang) OR (ty xang))) or (ky nang)) o hoi. hieu va dat nuoc va van dao cua tre*".