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
lang van » dang van, tang van, hoang van
hai cua » thai cua, dai cua, hoi cua
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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 (cac ky)) ((lang xa) or (lang van)) hoi. hieu va cam quoc ban hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (cac ky)) ((lang xa) OR (lang van)) hoi. hieu va cam quoc ban hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) ((lang xa) or (lang van)) hoi. hieu va cam quoc ban hanh hai cua tre*.