Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
dinh te » kinh te, dich te, dinh ve
nang ma » tang ma, sang ma, nang cao
va dinh » van dinh, va kinh, va tinh
hieu ve » hieu van
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
te cua » tue cua, le cua, de cua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) cham tuc va dinh te cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cham tuc va dinh te cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cham tuc va dinh te cua te*.