Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
cua viet » ca viet, cua vat, cua dieu
bien cac » vien cac, dien cac, bien ca
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
tuc va » thuc va, truc va, tuc xa

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 x)) hoi. thieu bien cac tuc va hanh vi ((cua viet) OR (hoa viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang x)) hoi. thieu bien cac tuc va hanh vi ((cua viet) OR (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. thieu bien cac tuc va hanh vi ((cua viet) OR (hoa viet))*.