Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tang van » dang van, hoang van, trong van
cham luc » cham soc, nhan luc, cham cuu
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tang ma » mang may
dau cua » dai cua, day cua, cau cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((tang ma) or (tang van)) hoi. hieu ve cham luc ((va danh) or (va hanh)) dau cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((tang ma) OR (tang van)) hoi. hieu ve cham luc ((va danh) OR (va hanh)) dau cua vat.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((tang ma) or (tang van)) hoi. hieu ve cham luc ((va danh) or (va hanh)) dau cua vat*.