Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
manh thanh » danh thanh, minh thanh, manh thang
thanh lai » thanh hai, thanh lap, thanh loi
duc manh » suc manh, duc anh, duc minh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
cua tuc » cua duc, cua tu, cua thuoc
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoc » co hoc, mo hoc, so hoc

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) or (so sach)) ky nang o hoc. hieu va pham duc manh thanh lai ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (so sach)) ky nang o hoc. hieu va pham duc manh thanh lai ((cua te) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (so sach)) ky nang o hoc. hieu va pham duc manh thanh lai ((cua te) or (cua tuc))*.