Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
hieu cua » hieu qua, dieu cua, bieu cua
cho cuu » cho chu, cho cu, cho cua
va danh » va dinh, va dan, va hanh
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren, cau treo
nang co » nang doc, nang noi, nang hoc
xuc va » duc va, tuc va, luc va

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

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