Perhaps you should try some spelling variations:
cam hoc » cao hoc, am hoc, cam hoa
vai cuu » vai cua
va kinh » va tinh, qua kinh
va dinh » van dinh, va tinh, vu dinh
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ve cam » ve cham, ve cac, va cam

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 ky) OR (sach y)) dang xa hoi. hieu ve cam hoc ((va dinh) or (va kinh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) dang xa hoi. hieu ve cam hoc ((va dinh) OR (va kinh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) dang xa hoi. hieu ve cam hoc ((va dinh) or (va kinh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) dang xa hoi. hieu ve cam hoc ((va dinh) or (va kinh)) vai cuu tre*.