Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
tu cuu » tu huu, tu chu, tu cau
tu cua » hu cua, vu cua

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 y nang xa hoi. hieu va cam xuc va dan ((du cuu) or (((tu cuu) OR (tu cua)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu va cam xuc va dan ((du cuu) OR (((tu cuu) OR (tu cua)))) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu va cam xuc va dan ((du cuu) or (((tu cuu) OR (tu cua)))) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu va cam xuc va dan ((du cuu) or (((tu cuu) OR (tu cua)))) tre*.