Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
va triet » va thiet, va trien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty xang, ty hang
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

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