Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, duc va
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: su sach ty nang ((ma hoa) or (xa hoi)). hieu ve cam ((tuc va) or (tuc xa)) hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoa) OR (xa hoi)). hieu ve cam ((tuc va) OR (tuc xa)) hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoa) or (xa hoi)). hieu ve cam ((tuc va) or (tuc xa)) hanh vi va triet*.