Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan
nang xa » nang x, nang ma, mang xa
tai cua » thai cua, tai cuc, tri cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam ((thuc va) or (thuc day)) thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam ((thuc va) OR (thuc day)) thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam ((thuc va) or (thuc day)) thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) OR (lang xa)) hoi. hieu van cam ((thuc va) or (thuc day)) thanh tai cua te*.