Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
phat duy » pham duy, phat huy, phan duy
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
duy van » duy vat, dung van
hieu va » lieu va, hieu qua
bang xa » lang xa, mang xa, ang xa
bang va » hang va, ban va, trang va
cua te » cua tu

You may be able to get more results by adjusting your search query.

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