Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
hieu cao » chieu cao, hieu cac, hieu ca
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang ma) or (nang cao)) hoi. hieu cao chat thuc va ((hanh dai) OR (hanh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (nang cao)) hoi. hieu cao chat thuc va ((hanh dai) OR (hanh dao)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) or (nang cao)) hoi. hieu cao chat thuc va ((hanh dai) OR (hanh dao)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) or (nang cao)) hoi. hieu cao chat thuc va ((hanh dai) OR (hanh dao)) cua tre*.