Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
thuc day » thuc dan
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
sach ly » sach y, sach lo, sach ty
thue va » thuc va, thuyet va, thuat va
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
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 vat))) 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 vat))) OR (thuc day)) nang tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ma hoi. hieu va cam ((((thue va) OR (thuc vat))) 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 vat))) or (thuc day)) nang tai cua tre*.