Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nong xa » song xa, dong xa, nong va
tu nong » tu dong, tu cong, tu tong
duc xa » duoc xa, tuc xa, duc va
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) tu nong xa hoi. hieu va dao duc xa ((hanh vai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu nong xa hoi. hieu va dao duc xa ((hanh vai) OR (hanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) tu nong xa hoi. hieu va dao duc xa ((hanh vai) or (hanh tai)) cua tre*.