Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nhan tai » hang tai, van tai, toan tai
cam suc » cam xuc, cao suc, cham soc
han tai » hang tai, van tai, toan tai
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cam suc manh ((han tai) or (nhan tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cam suc manh ((han tai) OR (nhan tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cam suc manh ((han tai) or (nhan tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cam suc manh ((han tai) or (nhan tai)) cua tre*.