Perhaps you should try some spelling variations:
khanh hai » thanh hai, nhanh hai, nhanh thai
van khanh » van thanh, van hanh, van anh
nang dai » nang tai, lang dai, nang cai
nang dau » hang dau, xang dau, nang du
hai cua » thai cua, dai cua, hoi cua
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sach y)) ((nang dai) or (nang dau)) hoi. hieu ve cac luc van khanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((nang dai) OR (nang dau)) hoi. hieu ve cac luc van khanh hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) ((nang dai) or (nang dau)) hoi. hieu ve cac luc van khanh hai cua tre*".