Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh van » thanh san, thanh toan, thanh phan
cua triet » cua viet, su triet, va triet
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
truc va » thuc va, thuc vat, trung va
tu nang » tru nang, tu nong, tu nano
van cua » vang cua, ban cua, dan cua
tuc va » thuc va, tuc xa, duc va
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach tu nang ((x hoi) or (o hoc)). hieu va cam ((tuc va) OR (truc va)) thanh van cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach tu nang ((x hoi) OR (o hoc)). hieu va cam ((tuc va) OR (truc va)) thanh van cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach tu nang ((x hoi) or (o hoc)). hieu va cam ((tuc va) OR (truc va)) thanh van cua triet*".