Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
thuc va » thuc dan, thuc day
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. thien van cam ((thuc va) or (thuc vat)) doanh 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. thien van cam ((thuc va) OR (thuc vat)) doanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) or (lang xa)) hoi. thien van cam ((thuc va) or (thuc vat)) doanh tai cua te*.