Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
phan lap » phan dau
hanh lam » thanh lap, hanh kem, hanh va
van chu » van chi, van phu, van cau
chu duc » thu duc, chua duoc, cuu duoc
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
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: tu sach ky nang o hoi. hieu van chu duc va ((hanh lam) or (phan lap)) ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu van chu duc va ((hanh lam) OR (phan lap)) ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu van chu duc va ((hanh lam) or (phan lap)) ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu van chu duc va ((hanh lam) or (phan lap)) ((cua triet) OR (su triet))*.