Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
cua duc » cua tuc, cua nuoc, cua quoc
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ma hoi » xa hoi, ma hoa, me hoi
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: su sach v nang ((ma hoi) or (mai hoi)). hieu van cau duc va thanh di cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((ma hoi) OR (mai hoi)). hieu van cau duc va thanh di cua duc.
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((ma hoi) or (mai hoi)). hieu van cau duc va thanh di cua duc*.