Perhaps you should try some spelling variations:
truc van » truc va, thuc van, truc ban
le triet » ve triet, le viet, su triet
van hanh » van thanh, ban hanh, van anh
cam truc » cau truc, nam truc, lam truoc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
tien » tieng, bien, vien

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 v nang xa hoi. ((hieu ve) or (hieu va)) cam truc van hanh va ((le triet) OR (le tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. ((hieu ve) OR (hieu va)) cam truc van hanh va ((le triet) OR (le tien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. ((hieu ve) or (hieu va)) cam truc van hanh va ((le triet) OR (le tien))*".