Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
du cuu » tu cuu
tu cua » hu cua, vu cua
va cam » va cham, va cac, va cao

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