Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cac bac » cac bai, cac ban, cac cach
bac may » ban may, bach mai, bac thay
ve cac » va cac, vien cac
bi van » bui van, binh van
x hoi » xa hoi, o hoi, x ho
bi va » bo va

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 ve cac bac may tinh ((bi va) or (((bi van) OR (vi van)))) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ve cac bac may tinh ((bi va) OR (((bi van) OR (vi van)))) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu ve cac bac may tinh ((bi va) or (((bi van) OR (vi van)))) thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ve cac bac may tinh ((bi va) or (((bi van) OR (vi van)))) thiet*.