Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
mai khoi » mai khoa, tai khoa, cac khoi
va danh » va dinh, va dan, va hanh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
soc va » hoc va, loc va, doc 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 ((ky lang) or (ky tang)) mai khoi. hieu ve cham soc va danh ((vi cua) OR (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky lang) OR (ky tang)) mai khoi. hieu ve cham soc va danh ((vi cua) OR (di cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky lang) or (ky tang)) mai khoi. hieu ve cham soc va danh ((vi cua) OR (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky lang) or (ky tang)) mai khoi. hieu ve cham soc va danh ((vi cua) OR (di cua)) te*.