Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
su triet » su viet, su tien, ve triet
cu triet » cua triet, cau triet, tu triet
cham loc » cham soc, chon loc, cham o
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
nang ma » tang ma, sang ma, nang cao
sach va » sach xa, sach ha, sach dao
va danh » va dinh, va dan, va hanh
nang xa » nang x, lang xa, mang xa
te sach » toc sach
loc va » hoc va, luc va

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 va ((nang xa) or (nang ma)) hoi. hieu van cham loc va danh dien ((cu triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach va ((nang xa) OR (nang ma)) hoi. hieu van cham loc va danh dien ((cu triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach va ((nang xa) or (nang ma)) hoi. hieu van cham loc va danh dien ((cu triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach va ((nang xa) or (nang ma)) hoi. hieu van cham loc va danh dien ((cu triet) OR (su triet))*.