Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh vi » thanh va, thanh ve, nhanh vi
dau xuc » dau xac, dau xua, dau nuoc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
xuc va » duc va, tuc va, luc va
va dau » va dao

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 y ((xang xa) OR (lang xa)) hoi. hieu va dau xuc va ((thanh vi) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((xang xa) OR (lang xa)) hoi. hieu va dau xuc va ((thanh vi) OR (hanh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((xang xa) OR (lang xa)) hoi. hieu va dau xuc va ((thanh vi) or (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((xang xa) OR (lang xa)) hoi. hieu va dau xuc va ((thanh vi) or (hanh vi)) cau tren*.