Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
su triet » su viet, su tien, ve triet
vanh dai » van dai, vanh tai, lanh dao
hieu va » lieu va, hieu qua
va vanh » va van, va danh, va hanh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
sach 2 » sach y
ma hoi » mai hoi, xa hoi, ma hoa
2 nang » v nang
dai su » dai sua, dai so, 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: te sach 2 nang ma hoi. ((hieu ve) or (hieu va)) pham thuc va vanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang ma hoi. ((hieu ve) OR (hieu va)) pham thuc va vanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang ma hoi. ((hieu ve) or (hieu va)) pham thuc va vanh dai su triet*.