Perhaps you should try some spelling variations:
sach vay » sach va, sach hay, sach nay
tu sach » thu sach, su sach, te sach
hanh ve » hanh vi, hanh va, hanh kem
va cham » va chat, va tham
hieu va » lieu va, hieu qua
lang xa » dang xay, lang van
lang ha » long ha
luu tre » luu tru, cuu tre, luy tre
luc va » tuc va, loc va
ve luu » ke luu, vi luu

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 vay ((lang xa) OR (lang ha)) hoi. hieu va cham ((luc va) or (duc va)) hanh ve luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vay ((lang xa) OR (lang ha)) hoi. hieu va cham ((luc va) OR (duc va)) hanh ve luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vay ((lang xa) OR (lang ha)) hoi. hieu va cham ((luc va) or (duc va)) hanh ve luu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach vay ((lang xa) OR (lang ha)) hoi. hieu va cham ((luc va) or (duc va)) hanh ve luu tre*.