Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay dang » tay dong, tay dung, tay lang
manh hai » lanh hai, minh hai, thanh hai
tu sach » thu sach, su sach, te sach
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xac va » tac va, ac va, bac va

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 dang xa hoi. hieu ve cam ((xac va) or (duc va)) manh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay dang xa hoi. hieu ve cam ((xac va) OR (duc va)) manh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tay dang xa hoi. hieu ve cam ((xac va) or (duc va)) manh hai cua tre*.