Perhaps you should try some spelling variations:
hien nhien » thien nhien, thien chien, vien nghien
nhien cac » hien cac, thien cac, vien cac
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 ty ((nang xa) or (nang x)) hoi. hien nhien cac ((xuc va) OR (luc va)) hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((nang xa) OR (nang x)) hoi. hien nhien cac ((xuc va) OR (luc va)) hanh dai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ((nang xa) or (nang x)) hoi. hien nhien cac ((xuc va) OR (luc va)) hanh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((nang xa) or (nang x)) hoi. hien nhien cac ((xuc va) OR (luc va)) hanh dai cua viet*.