Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
pham duy » pham duc
cham duc » pham duc, cham soc, phan duc
sach ty » sach y, sach tu, sach thu
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
tu sach » thu sach, su sach, te sach
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) OR (hang di)) va triet~.
• 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) OR (hang di)) va triet.
• 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) OR (hang di)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve ((cham duc) or (pham duy)) va ((hanh di) OR (hang di)) va triet*.