Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc day
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
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 ty hang xa hoi. ((hieu va) or (hieu qua)) cau ((thuc va) or (thuc dan)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. ((hieu va) OR (hieu qua)) cau ((thuc va) OR (thuc dan)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. ((hieu va) or (hieu qua)) cau ((thuc va) or (thuc dan)) hanh thai cua tre*.