Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
su triet » su viet, su tien
ve triet » va trien
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ly hang xa hoi. hieu va cam tuc va hanh di ((su triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ly hang xa hoi. hieu va cam tuc va hanh di ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: doc sach ly hang xa hoi. hieu va cam tuc va hanh di ((su triet) OR (ve triet))*.