Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nang vi » hang vi, nang ji, nang si
va nang » van nang, da nang, cam nang
vu nang » vuc nang, vu dang, vu bang
ke cau » ket cau
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
ve cau » va cau, ve cac, le cau
v nang » van nang, voi nang, vuc nang
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((v nang) or (vu nang)) xa hoi. hieu ((ve cau) OR (ke cau)) luc va nang vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (vu nang)) xa hoi. hieu ((ve cau) OR (ke cau)) luc va nang vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((v nang) or (vu nang)) xa hoi. hieu ((ve cau) OR (ke cau)) luc va nang vi cua tu".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) or (vu nang)) xa hoi. hieu ((ve cau) OR (ke cau)) luc va nang vi cua tu*.