Perhaps you should try some spelling variations:
hien bien » dien bien, khien dien, hien nhien
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
cac xuc » cac nuoc, chat xuc, cac cuoc
va hanh » van hanh, va thanh, va danh

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 bien ((cac xuc) OR (cam xuc)) 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 bien ((cac xuc) OR (cam xuc)) 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 bien ((cac xuc) OR (cam xuc)) va hanh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((nang xa) or (nang x)) hoi. hien bien ((cac xuc) OR (cam xuc)) va hanh dai cua viet*.