Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lam » thanh lap, hanh kem, hanh va
duc manh » suc manh, duc anh, duc minh
thu sach » tu sach, thuat sach, thuoc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
lam cua » nam cua, lam chat
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

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