Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ve triet » va trien, su triet
danh sai » dung sai, danh bat, danh dau
cac tuc » cac toc, cac tu, cac tac
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
tuc va » thuc va, truc va, tuc xa
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: ((te sach) OR (toc sach)) ky dang xa hoi. hieu va cac tuc va danh sai ((ve triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xa hoi. hieu va cac tuc va danh sai ((ve triet) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky dang xa hoi. hieu va cac tuc va danh sai ((ve triet) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky dang xa hoi. hieu va cac tuc va danh sai ((ve triet) or (cua te))*.