Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh noi » ha noi, hanh vi, nang noi
va chat » van chat, va phat, cao chat
noi cua » hoi cua, doi cua, moi cua
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
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: ((te sach) OR (toc sach)) ty hang xa hoi. hieu va chat ((duc va) or (tuc xa)) hanh noi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty hang xa hoi. hieu va chat ((duc va) OR (tuc xa)) hanh noi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty hang xa hoi. hieu va chat ((duc va) or (tuc xa)) hanh noi cua te*".