Perhaps you should try some spelling variations:
nhan tai » hang tai, van tai, toan tai
hanh tai » thanh tai, hang tai, han tai
cao suc » cao su, cao duc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cao » va cac, va co, va dao

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