Perhaps you should try some spelling variations:
banh dai » benh dai, ban dai, vanh dai
ban banh » ban hanh, ban anh, ban danh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, chat xuc, cac cuoc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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 ty ((nang xa) or (lang van)) hoi. hieu qua ((cac xuc) OR (cac nuoc)) ban banh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang van)) hoi. hieu qua ((cac xuc) OR (cac nuoc)) ban banh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (lang van)) hoi. hieu qua ((cac xuc) OR (cac nuoc)) ban banh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (lang van)) hoi. hieu qua ((cac xuc) OR (cac nuoc)) ban banh dai cua tre*.