Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hang vat » dang vat, bang vat, cang vat
hieu van » hieu va, thien van, lieu va
nam tuc » nam thuc, nam truc, nam tu
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cuc tu » cuc du, luc tu, duc tu

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 y ((hang va) or (hang vat)) hoi. hieu van nam tuc ((va hanh) OR (va danh)) tai cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((hang va) OR (hang vat)) hoi. hieu van nam tuc ((va hanh) OR (va danh)) tai cuc tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y ((hang va) or (hang vat)) hoi. hieu van nam tuc ((va hanh) OR (va danh)) tai cuc tu".
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((hang va) or (hang vat)) hoi. hieu van nam tuc ((va hanh) OR (va danh)) tai cuc tu*.