Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang van » hoang van, hang va
thuc dan » thuc hanh, hoc dan, thuc vat
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
van hoi » van hoa, van hoc, van hoe
hieu va » hieu qua
dan dan » dang dan, ban dan, dao dan
cuu tre » cua tre, cau tren, cau treo
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang van hoi. ((hieu va) OR (lieu va)) am thuc dan dan va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang van hoi. ((hieu va) OR (lieu va)) am thuc dan dan va cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang van hoi. ((hieu va) OR (lieu va)) am thuc dan dan va cuu tre*.