Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
cac luc » cau luc, cac nuoc, cac cuoc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan le » ban le, van le, dan ve
le cua » ly cua
x hoi » xa hoi, o hoi, x ho

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 (hoc sach)) y nang x hoi. hieu va ((cac luc) or (coc luc)) va dan le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) y nang x hoi. hieu va ((cac luc) OR (coc luc)) va dan le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) y nang x hoi. hieu va ((cac luc) or (coc luc)) va dan le cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) y nang x hoi. hieu va ((cac luc) or (coc luc)) va dan le cua tre*.