Perhaps you should try some spelling variations:
dieu hoa » dien hoa, tieu hoa, hieu hoa
hanh tai » thanh tai, hang tai, han tai
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ha » hieu hoa, hieu va, hieu ca
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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) or (thuat toan)) ky lang xa hoi. ((hieu ha) or (dieu hoa)) nam thuc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat toan)) ky lang xa hoi. ((hieu ha) OR (dieu hoa)) nam thuc va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat toan)) ky lang xa hoi. ((hieu ha) or (dieu hoa)) nam thuc va hanh tai cua tre*.