Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach tai
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
sach nay » sach hay, sach vay, sach nang
ca tren » cau tren, cu tren, la tren
lang xa » lang ha, dang xay, lang van
va dau » va dao
luc va » duc va, tuc va, loc va
va cao » va cac, va co, va dao
di ca » di cau, di cua, doi ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ((va cao) or (va dau)) luc va thanh di ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ((va cao) OR (va dau)) luc va thanh di ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ((va cao) or (va dau)) luc va thanh di ca tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ((va cao) or (va dau)) luc va thanh di ca tren*.