Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh di » hanh vi, hanh de, hang di
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
cua duc » cua tuc, cua nuoc, cua quoc
ma hoi » mai hoi, xa hoi, ma hoa
_ sang » _ san
v sang » va sang, ve sang, van sang
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: toc sach ((v sang) or (_ sang)) ma hoi. hieu ve chat ((xuc van) or (luc van)) hanh di cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v sang) OR (_ sang)) ma hoi. hieu ve chat ((xuc van) OR (luc van)) hanh di cua duc.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v sang) or (_ sang)) ma hoi. hieu ve chat ((xuc van) or (luc van)) hanh di cua duc*.