Perhaps you should try some spelling variations:
cham duc » pham duy, phan duc, cham cuu
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
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 xa hoi. hieu ve ((((cham duc) OR (cham soc))) or (pham duc)) va xanh di va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve ((((cham duc) OR (cham soc))) OR (pham duc)) va xanh di va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ve ((((cham duc) OR (cham soc))) or (pham duc)) va xanh di va trien".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve ((((cham duc) OR (cham soc))) or (pham duc)) va xanh di va trien*.