Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
so hoc » co hoc, mo hoc, so hoa
xuc va » tuc va, luc va, xac va
lam su » lai su, lam so, lam vu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((o hoi) or (so hoc)). hieu van cam ((xuc va) OR (duc va)) thanh lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hoi) OR (so hoc)). hieu van cam ((xuc va) OR (duc va)) thanh lam su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((o hoi) or (so hoc)). hieu van cam ((xuc va) OR (duc va)) thanh lam su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoi) or (so hoc)). hieu van cam ((xuc va) OR (duc va)) thanh lam su triet*.