Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
doan cua » doanh cua, dan cua, toan cua
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach ty
ma hoi » mai hoi, xa hoi, ma hoa
xuc xa » tuc xa
buc xa » tuc xa
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sach tu)) nang ma hoi. hieu va cao ((xuc xa) OR (buc xa)) phuong doan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach tu)) nang ma hoi. hieu va cao ((xuc xa) OR (buc xa)) phuong doan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) or (sach tu)) nang ma hoi. hieu va cao ((xuc xa) OR (buc xa)) phuong doan cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sach tu)) nang ma hoi. hieu va cao ((xuc xa) OR (buc xa)) phuong doan cua tre*.