Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
ve triet » va trien, su triet
dinh sai » dinh tai, danh sai, dinh hai
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
nam tuc » nam thuc, nam truc, nam tu
va dinh » van dinh, va kinh, va tinh
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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) OR (thuoc sach)) ky lang xa hoi. hieu van nam tuc va dinh sai ((ve triet) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van nam tuc va dinh sai ((ve triet) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van nam tuc va dinh sai ((ve triet) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van nam tuc va dinh sai ((ve triet) or (cua tu))*.