Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi va » vi van, vai va, vu va

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 y nang ((xa hoi) or (mai hoi)). hieu ve cam ((xuc va) OR (tuc va)) hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((xa hoi) OR (mai hoi)). hieu ve cam ((xuc va) OR (tuc va)) hanh vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((xa hoi) or (mai hoi)). hieu ve cam ((xuc va) OR (tuc va)) hanh vi va triet*".