Perhaps you should try some spelling variations:
van tuan » van quan, van ban, anh tuan
ban hanh » ban hang
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
ve cam » ve cham, ve cac, va cam
kien » bien, vien, tien

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

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