Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham luc » cham soc, nhan luc, cham cuu
ly quang » le quang, vu quang
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

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