Perhaps you should try some spelling variations:
chieu chien » thien chien, hieu hien
hieu viec » nhieu viec, hieu ve, sieu viet
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang ma » tang ma, sang ma, nang cao
bac hoc » bai hoc, bac ho
va hanh » van hanh, va thanh, va danh
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 tu nang ma hoa. ((hieu viec) or (chieu chien)) bac hoc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ma hoa. ((hieu viec) OR (chieu chien)) bac hoc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ma hoa. ((hieu viec) or (chieu chien)) bac hoc va hanh vi cua viet*.