Perhaps you should try some spelling variations:
trinh ban » trinh han, trinh san, trinh dan
va trinh » van trinh, va tinh, lap trinh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ban cua » ban quan
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang ma, mang xa, ang xa

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

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