Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v nang x hoi. ((hieu ve) or (hieu va)) cam truc van hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. ((hieu ve) OR (hieu va)) cam truc van hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang x hoi. ((hieu ve) or (hieu va)) cam truc van hanh va su triet*.