Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
hanh doi » thanh doi, hanh noi, hang doi
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
y xang » ty xang
cua tu » cua tuc, cua su, cua cu

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 xa) or (thuc dan)) hanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y xang xa hoi. hieu va phat ((tuc xa) OR (thuc dan)) hanh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach y xang xa hoi. hieu va phat ((tuc xa) or (thuc dan)) hanh doi cua tu*.