Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoc, van hoe
dan dao » van dao, dan dat, dan da
cuu tre » cua tre, cau tren, cau treo
dao va » dao van, tao va, do 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 nang van hoi. hieu ((ha nam) or (van nam)) hoc dan dao va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang van hoi. hieu ((ha nam) OR (van nam)) hoc dan dao va cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang van hoi. hieu ((ha nam) or (van nam)) hoc dan dao va cuu tre*.