Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
cham duc » cham soc, pham duy, phan duc
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) OR (ty hang)) x hoi. hieu ve ((cham duc) or (pham duc)) va danh di va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) x hoi. hieu ve ((cham duc) OR (pham duc)) va danh di va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) x hoi. hieu ve ((cham duc) or (pham duc)) va danh di va trien".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) x hoi. hieu ve ((cham duc) or (pham duc)) va danh di va trien*.