Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham luc » cham soc, nhan luc, cham cuu
ly quang » le quang, vu quang
ve cham » va cham, ve chat, vu cham
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
vi cua » di cua

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 ((ly hang) or (ly quang)) xa hoi. hieu ve cham luc va hanh ((vi cua) OR (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ly hang) OR (ly quang)) xa hoi. hieu ve cham luc va hanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ly hang) or (ly quang)) xa hoi. hieu ve cham luc va hanh ((vi cua) OR (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ly hang) or (ly quang)) xa hoi. hieu ve cham luc va hanh ((vi cua) OR (vai cua)) te*.