Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu nang » thu hang, thu bang, tho nang
thi nang » thi cong, ki nang, thi hanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, dua tren
x hoi » xa hoi, o hoi, x ho

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