Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cam luc » cau luc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
da nang » cam nang, kha nang, cao nang
v nang » va nang, vu nang, van nang
va dan » ca dan, va dao, va dau
dan de » dan den, dang de, van de
de cua » le cua, te cua, dieu 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 ((v nang) or (da nang)) x hoi. hieu va ((cam luc) OR (cam xuc)) va dan de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (da nang)) x hoi. hieu va ((cam luc) OR (cam xuc)) va dan de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((v nang) or (da nang)) x hoi. hieu va ((cam luc) OR (cam xuc)) va dan de cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) or (da nang)) x hoi. hieu va ((cam luc) OR (cam xuc)) va dan de cua tre*.