Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
hanh dai » hanh tai, hanh dao, thanh dat
vanh dai » van dai, vanh tai, lanh dao
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc dan, thuc day
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang ma hoi. hieu vi pham thuc va ((hanh dai) OR (vanh dai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ma hoi. hieu vi pham thuc va ((hanh dai) OR (vanh dai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ma hoi. hieu vi pham thuc va ((hanh dai) OR (vanh dai)) cua triet*.