Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
danh cao » doanh cao, danh cho, danh ca
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao

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

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