Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
manh han » manh hai, manh hon, anh han
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
cam suc » cam xuc, cao suc, cham soc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, 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: ((te sach) OR (toc sach)) ky ((nang xa) or (nang x)) hoi. hieu ve cam suc manh han tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve cam suc manh han tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky ((nang xa) or (nang x)) hoi. hieu ve cam suc manh han tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky ((nang xa) or (nang x)) hoi. hieu ve cam suc manh han tai cua tre*.