Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
hanh van » thanh van, khanh van, hanh va
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu vi » hieu voi, hieu ve, hien vi
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
van su » dan su

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 nang ma hoi. ((hieu vi) OR (hieu va)) pham thuc va hanh van su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang ma hoi. ((hieu vi) OR (hieu va)) pham thuc va hanh van su triet".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang ma hoi. ((hieu vi) OR (hieu va)) pham thuc va hanh van su triet*.