Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam duoc » nam thuoc, da duoc, dat duoc
va thanh » gia thanh, ban thanh, va tinh
ly hang » ly quang
hieu va » lieu va, hieu qua
ly nang » ky nang, ly vang, ly quang
san cuu » san cua, san huu, song cuu
cuu tre » cua tre, cau tren, cau treo
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: thuoc sach ((ly nang) OR (ly hang)) o hoi. hieu va ((nam duoc) or (pham duc)) va thanh san cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ly nang) OR (ly hang)) o hoi. hieu va ((nam duoc) OR (pham duc)) va thanh san cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ly nang) OR (ly hang)) o hoi. hieu va ((nam duoc) or (pham duc)) va thanh san cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ly nang) OR (ly hang)) o hoi. hieu va ((nam duoc) or (pham duc)) va thanh san cuu tre*.