Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
thuc day » thuc dan, thuc vat
thue va » thuc va, thuyet va, thuc vat
tai cua » thai cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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 ly nang ma hoi. hieu va cam ((thue va) or (thuc day)) nang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ma hoi. hieu va cam ((thue va) OR (thuc day)) nang tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ma hoi. hieu va cam ((thue va) or (thuc day)) nang tai cua tre*.