Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
hanh lam » thanh lap, hanh kem, hanh va
chat duc » chat xuc, chat doc, chet duoc
van chat » cao chat
hieu van » hieu va, thien van, lieu va
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
tu sach » su sach, te sach, tu cach
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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) OR (thu sach)) ky nang ((o hoi) or (o hai)). hieu van chat duc va hanh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((o hoi) OR (o hai)). hieu van chat duc va hanh lam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang ((o hoi) or (o hai)). hieu van chat duc va hanh lam cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang ((o hoi) or (o hai)). hieu van chat duc va hanh lam cua triet*.