Perhaps you should try some spelling variations:
pham duy » pham duc
va triet » va trien, ve triet, cua triet
tu sach » thu sach, su sach, te sach
nang di » nang du, hang di, nang ji
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
va nang » van nang, da nang, cam nang
thiet » thieu

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 soc) or (pham duy)) va nang di ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve ((cham soc) OR (pham duy)) va nang di ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve ((cham soc) or (pham duy)) va nang di ((va triet) or (va thiet))*.