Perhaps you should try some spelling variations:
tinh tai » trinh tai, tinh thai, tinh hai
sach dao » lanh dao
nam thuc » nam thuoc, am thuc, nam thu
tai cua » thai cua, tai cuc, tri cua
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
hang ca » hang va, nang cao, hang tai
hang xa » hoang xa, hang va, lang xa
ve nam » he nam, va nam, le nam

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 ly) or (sach dao)) ((hang xa) or (hang ca)) hoi. hieu ve nam thuc va tinh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach dao)) ((hang xa) OR (hang ca)) hoi. hieu ve nam thuc va tinh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach dao)) ((hang xa) or (hang ca)) hoi. hieu ve nam thuc va tinh tai cua tre*.