Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
ly nang » ky nang, ly vang, ly quang
ly hang » ly quang
cam duc » cam xuc, cao duc, nam duoc
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
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: thu sach ((ly nang) OR (ly hang)) o hoi. lieu va ((cam duc) or (pham duc)) va thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly nang) OR (ly hang)) o hoi. lieu va ((cam duc) OR (pham duc)) va thanh san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ly nang) OR (ly hang)) o hoi. lieu va ((cam duc) or (pham duc)) va thanh san cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly nang) OR (ly hang)) o hoi. lieu va ((cam duc) or (pham duc)) va thanh san cua tre*.