Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
cam quoc » cac quoc, cao quoc, nam quoc
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky

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 (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu ve cam quoc ban hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu ve cam quoc ban hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu ve cam quoc ban hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu ve cam quoc ban hanh hai cua tre*.