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