Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
chat duc » chat xuc, chat doc, chet duoc
danh ca » dan ca, doanh cua, danh cho
va danh » va dinh, va dan, va hanh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
ma hoi » mai hoi, ma hoa, me hoi
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: ((thu sach) or (te sach)) y nang ((ma hoi) OR (xa hoi)). hieu va chat duc va danh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) y nang ((ma hoi) OR (xa hoi)). hieu va chat duc va danh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) y nang ((ma hoi) OR (xa hoi)). hieu va chat duc va danh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) y nang ((ma hoi) OR (xa hoi)). hieu va chat duc va danh ca cua tre*.