Perhaps you should try some spelling variations:
sach tri » sach tai, sach tren, sach truc
cac thuc » cach thuc, cac thu, can thuc
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tri ((nang xa) OR (nang ma)) hoi. hieu va cac thuc day hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tri ((nang xa) OR (nang ma)) hoi. hieu va cac thuc day hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tri ((nang xa) OR (nang ma)) hoi. hieu va cac thuc day hanh tai cua tre*.