Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
thuat va » thuyet va, thuat xay, thuat bai
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
va cam » va cham, va cac, va cao

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 ty ((nang ma) OR (tang ma)) hoi. lieu va cam ((thuat va) or (thuc va)) nang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (tang ma)) hoi. lieu va cam ((thuat va) OR (thuc va)) nang tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang ma) OR (tang ma)) hoi. lieu va cam ((thuat va) or (thuc va)) nang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) OR (tang ma)) hoi. lieu va cam ((thuat va) or (thuc va)) nang tai cua tre*.