Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thue va » thuyet va, thuc vat, thuat va
thuc va » thuc vat, thuc dan, thuc day
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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 y nang ma hoi. hieu va cam ((thue va) OR (thuc va)) nang tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu va cam ((thue va) OR (thuc va)) nang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu va cam ((thue va) OR (thuc va)) nang tai cua tre*.