Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
thuc va » thuc dan, thuc day
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: tu sach tu nang xa hoi. ((hieu va) or (hieu qua)) cau ((thuc va) OR (thuc vat)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang xa hoi. ((hieu va) OR (hieu qua)) cau ((thuc va) OR (thuc vat)) hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang xa hoi. ((hieu va) or (hieu qua)) cau ((thuc va) OR (thuc vat)) hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. ((hieu va) or (hieu qua)) cau ((thuc va) OR (thuc vat)) hanh thai cua tre*.