Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
pham duy » pham duc
va triet » va thiet, ve triet, cua triet
cham duc » pham duc, cham soc, phan duc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 (pham duy)) va hanh di ((va triet) OR (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 (pham duy)) va hanh di ((va triet) OR (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 (pham duy)) va hanh di ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve ((cham duc) or (pham duy)) va hanh di ((va triet) OR (va trien))*.