Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
ty nang » ky nang, ty xang, ty hang
hieu vi » hieu voi, hieu va, hieu ve
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
x hoi » xa hoi, o hoi, x ho
pham » phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) ty nang x hoi. hieu vi pham duc van hanh ((vai cua) or (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ty nang x hoi. hieu vi pham duc van hanh ((vai cua) OR (lai cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ty nang x hoi. hieu vi pham duc van hanh ((vai cua) or (lai cua)) te*".