Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien
van hanh » van thanh, ban hanh, van anh
ve triet » va trien
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
te sach » toc sach
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (te sach)) ty xang xa hoi. hieu va cam duc van hanh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ty xang xa hoi. hieu va cam duc van hanh vi ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ty xang xa hoi. hieu va cam duc van hanh vi ((su triet) or (ve triet))*.