Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
chat tuc » luat tuc, chat huu, chat cua
tu sach » thu sach, su sach, te sach
danh ca » dan ca, doanh cua, danh cho
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
ca cua » co cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) y nang ma hoi. hieu va ((chat tuc) OR (chat xuc)) va danh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) y nang ma hoi. hieu va ((chat tuc) OR (chat xuc)) va danh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) y nang ma hoi. hieu va ((chat tuc) OR (chat xuc)) va danh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) y nang ma hoi. hieu va ((chat tuc) OR (chat xuc)) va danh ca cua tre*.