Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
tu sach » thu sach, te sach, tu cach
nang co » nang cao, nang doc, nang noi
ly nang » ky nang, ly hang, ly vang
su sach » so sach, vu sach
soc va » hoc va, loc va, doc va
vi cua » vai cua, di cua

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 (su sach)) ly nang co hoc. hieu ((ve cham) OR (vu cham)) soc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ly nang co hoc. hieu ((ve cham) OR (vu cham)) soc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ly nang co hoc. hieu ((ve cham) OR (vu cham)) soc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ly nang co hoc. hieu ((ve cham) OR (vu cham)) soc va hanh vi cua viet*.