Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
dinh lam » dinh van, tinh lao
va dinh » van dinh, va kinh, va tinh
duoc va » nuoc va, duc va, duoc ma
ve chet » ve chat, ve che, se chet
hieu ve » hieu va, hieu van
y sang » duy sang
ma hoi » mai hoi, xa hoi, ma hoa
_ sang » _ san
cua te » cua tu

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 sang) or (_ sang)) ma hoi. hieu ve chet duoc va dinh lam ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y sang) OR (_ sang)) ma hoi. hieu ve chet duoc va dinh lam ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ((y sang) or (_ sang)) ma hoi. hieu ve chet duoc va dinh lam ((dua tren) or (cua te))*.