Perhaps you should try some spelling variations:
te sach » toc sach
dinh te » kinh te, dich te, dinh ve
truc va » thuc va, thuc vat, trung va
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
lang xa » dang xay, lang van
tuc va » thuc va, tuc xa, duc va
te cua » tue cua, le cua, de cua
ve cam » ve cham, ve cac, va cam

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 tu ((lang xa) or (lang ha)) hoi. hieu ve cam ((tuc va) or (truc va)) dinh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((lang xa) OR (lang ha)) hoi. hieu ve cam ((tuc va) OR (truc va)) dinh te cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((lang xa) or (lang ha)) hoi. hieu ve cam ((tuc va) or (truc va)) dinh te cua tre*.