Perhaps you should try some spelling variations:
nhan tri » nhan tai, nhanh thi, thanh tri
va nhan » van nhan, ca nhan, va phan
truc va » thuc va, thuc vat, trung va
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
so sach » so sanh, bo sach, co sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
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)) truc va nhan tri 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)) truc va nhan tri 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)) truc va nhan tri 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)) truc va nhan tri va thiet*.