Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
toc sach » hoc sach, doc sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cua viet » ca viet, hoa viet, cua vat
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
cac xuc » cam xuc, chat xuc, cac cuoc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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