Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
cau thuc » cau truc, cuu thuc, can thuc
tu sach » thu sach, su sach, te sach
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 va » lieu va
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang

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 ((tu nang) OR (tu nong)) xa hoi. ((hieu va) or (hieu qua)) cau thuc va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nong)) xa hoi. ((hieu va) OR (hieu qua)) cau thuc va hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) OR (tu nong)) xa hoi. ((hieu va) or (hieu qua)) cau thuc va hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) OR (tu nong)) xa hoi. ((hieu va) or (hieu qua)) cau thuc va hanh thai cua tre*.