Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hanh tai » thanh tai, hang tai, han tai
sach ky » sach y, sach ty, sach kem
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va cao » va cac, va co, va dao
sac ky » cac ky, sai ky
ve cao » ve bao, ve cac, ve co

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