Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va trien, ve triet, cua triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
cua te » cua tu
thiet » thieu

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 ky nang ma hoi. hieu ve cam xuc va hanh vi ((cua te) or (((va triet) OR (va thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoi. hieu ve cam xuc va hanh vi ((cua te) OR (((va triet) OR (va thiet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ma hoi. hieu ve cam xuc va hanh vi ((cua te) or (((va triet) OR (va thiet))))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ma hoi. hieu ve cam xuc va hanh vi ((cua te) or (((va triet) OR (va thiet))))*.