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
lang di » lang dai, hang di, lang du
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 lang » va nang, hoa lang
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 lang 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 lang di ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ve ((cham soc) or (pham duy)) va lang 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 lang di ((va triet) OR (va thiet))*.