Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
tuc va » truc va, tuc xa, duc va
dai va » mai va

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

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