Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cao » va cao, ve bao, ve cac
x hoi » xa hoi, o hoi, x ho
oi su » ki su, vi su
ve su » va su

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 cao duc tan hanh ((oi su) or (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. hieu ve cao duc tan hanh ((oi su) OR (ve su)) triet*.