Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cua tre » cuu tre, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
sach v » sach va, sach y, sach 2
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
cua te » cua tu

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