Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
han tai » hang tai, nhan tai, van tai
y nang » ly nang, v nang, may nang
va han » va phan, van han, va hanh
tai va » thai va, mai va, tri va
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: su sach ((y nang) OR (ky nang)) xa hoi. hieu ((ve cham) or (ve chat)) duc va han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. hieu ((ve cham) OR (ve chat)) duc va han tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) xa hoi. hieu ((ve cham) or (ve chat)) duc va han tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) xa hoi. hieu ((ve cham) or (ve chat)) duc va han tai va thiet*.