Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
toc sach » hoc sach, doc sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
danh vi » dinh vi, danh di, danh va
cua tre » cua te, cuu tre, cua triet
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) or (toc sach)) ky nang x ho. hieu ve cam thuc va ((danh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky nang x ho. hieu ve cam thuc va ((danh vi) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky nang x ho. hieu ve cam thuc va ((danh vi) or (hanh vi)) cua tre*.