Perhaps you should try some spelling variations:
nhan tai » hang tai, van tai, toan tai
so sach » so sanh, bo sach, co sach
va nhan » van nhan, ca nhan, va phan
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
tuc va » thuc va, truc va, tuc xa
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: so sach ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) tuc va nhan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) OR (va cham)) tuc va nhan tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) tuc va nhan tai va thiet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) tuc va nhan tai va thiet*.