Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang co hoi. hieu ve cam xuc ((va hanh) or (van hanh)) vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang co hoi. hieu ve cam xuc ((va hanh) OR (van hanh)) vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang co hoi. hieu ve cam xuc ((va hanh) or (van hanh)) vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang co hoi. hieu ve cam xuc ((va hanh) or (van hanh)) vai ((cua tre) OR (cua triet))*.