Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
dien cua » dieu cua, dien cuc, dien cu
te sach » toc sach
hieu va » lieu va, hieu qua
sach va » sach xa, sach ha, sach dao
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
va nang » van nang, da nang, cam nang
doc va » duoc va, hoc va, duc va
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa
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: te sach va nang ma hoi. ((hieu ve) OR (hieu va)) cham ((doc va) or (loc va)) dinh dien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach va nang ma hoi. ((hieu ve) OR (hieu va)) cham ((doc va) OR (loc va)) dinh dien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach va nang ma hoi. ((hieu ve) OR (hieu va)) cham ((doc va) or (loc va)) dinh dien cua te".
• Adding a wildcard symbol may retrieve word variants: te sach va nang ma hoi. ((hieu ve) OR (hieu va)) cham ((doc va) or (loc va)) dinh dien cua te*.