Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
tham duc » pham duc, than duc, thach duc
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
su sach » so sach, vu sach
tham du » thap du, tham do, pham duc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
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 ty nang x hoi. hieu van ((tham duc) OR (tham du)) ban hanh ((hai cua) or (hoi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu van ((tham duc) OR (tham du)) ban hanh ((hai cua) OR (hoi cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu van ((tham duc) OR (tham du)) ban hanh ((hai cua) or (hoi cua)) triet*".