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