Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hieu van » hieu va, thien van, lieu va
dan vinh » dang vinh, danh vinh, van vinh
vinh cuu » dinh cuu, sinh cua, dinh cu
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
cam tu » cam thu, nam tu, dam tu
va dan » ca dan, va dao, va dau

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) OR (doc sach)) y nang xa hoi. hieu van cam tu va dan vinh cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang xa hoi. hieu van cam tu va dan vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y nang xa hoi. hieu van cam tu va dan vinh cuu tre*.