Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet
doc sach » hoc sach, toc sach, nuoc sach
va triet » va thiet, va trien, ve triet
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
dan lai » dan loai, dan lap, dan lat
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky sang ma hoi. hieu ve pham thuc va dan lai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky sang ma hoi. hieu ve pham thuc va dan lai ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky sang ma hoi. hieu ve pham thuc va dan lai ((cua triet) or (va triet))*.