Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang cau » nang cao, hang cau, nang dau
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va nang » van nang, da nang, cam nang
va hanh » van hanh, va thanh, va danh
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang cau hoi. lieu va nang luc ((va hanh) or (van anh)) tai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang cau hoi. lieu va nang luc ((va hanh) OR (van anh)) tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang cau hoi. lieu va nang luc ((va hanh) or (van anh)) tai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang cau hoi. lieu va nang luc ((va hanh) or (van anh)) tai ((cua tre) OR (cua triet))*.