Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
hanh doi » thanh doi, hanh noi, hang doi
doc sach » hoc sach, nuoc sach, dac sac
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
y xang » ty xang
tuc va » truc va, tuc xa, duc va
cua te » cua tu

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