Perhaps you should try some spelling variations:
manh hai » lanh hai, minh hai, thanh hai
ban manh » ban hanh, van manh, ban mach
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
xuc ban » duc ban, cuc ban, quoc ban
cac xuc » cam xuc, cac nuoc, chat xuc
qua cac » cua cac
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay
nang xa » nang x, nang ma, mang xa
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 xa))) or (lang van)) hoi. hieu qua cac xuc ban manh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((((nang xa) OR (lang xa))) OR (lang van)) hoi. hieu qua cac xuc ban manh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((((nang xa) OR (lang xa))) or (lang van)) hoi. hieu qua cac xuc ban manh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((((nang xa) OR (lang xa))) or (lang van)) hoi. hieu qua cac xuc ban manh hai cua tre*.