Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
vu sach » vu bach, su sach, vu khach
hai cuc » tai cuc, hai cua, thai cua
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty ((nang xa) or (lang xa)) hoi. hieu van cau ((truc va) or (thuc day)) thanh hai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (lang xa)) hoi. hieu van cau ((truc va) OR (thuc day)) thanh hai cuc tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((nang xa) or (lang xa)) hoi. hieu van cau ((truc va) or (thuc day)) thanh hai cuc tre*.