Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
doi cua » dai cua
hoi cua » hoi chuc
y xang » ty xang
tuc va » truc va, tuc xa, duc va

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 xang xa hoi. hieu va phat ((tuc va) or (thuc va)) hanh ((doi cua) OR (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y xang xa hoi. hieu va phat ((tuc va) OR (thuc va)) hanh ((doi cua) OR (hoi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y xang xa hoi. hieu va phat ((tuc va) or (thuc va)) hanh ((doi cua) OR (hoi cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach y xang xa hoi. hieu va phat ((tuc va) or (thuc va)) hanh ((doi cua) OR (hoi cua)) te*.