Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu ve cau luc va hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu ve cau luc va hanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu ve cau luc va hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu ve cau luc va hanh vi ve triet*.