Perhaps you should try some spelling variations:
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 ky) or (sach ty)) nang x hoi. hieu van cham duc ban hanh ((vi cua) OR (di cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang x hoi. hieu van cham duc ban hanh ((vi cua) OR (di cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach ty)) nang x hoi. hieu van cham duc ban hanh ((vi cua) OR (di cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang x hoi. hieu van cham duc ban hanh ((vi cua) OR (di cua)) triet*.