Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
dinh dau » dinh dat, dinh du, danh dau
lang xa » lang ha, dang xay, lang van
thi van » thi lan, thi hanh, thi nang
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, dua tren
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. ((thien van) or (thi van)) nham thuc va dinh dau ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang xa hoi. ((thien van) OR (thi van)) nham thuc va dinh dau ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y lang xa hoi. ((thien van) or (thi van)) nham thuc va dinh dau ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach y lang xa hoi. ((thien van) or (thi van)) nham thuc va dinh dau ((cua tre) OR (cua triet))*.