Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh dat » thanh san, thanh van, thanh ha
toc sach » hoc sach, doc sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ly nang ((ma hoi) or (mai hoi)). hieu va cac thuc vat ((thanh dat) OR (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang ((ma hoi) OR (mai hoi)). hieu va cac thuc vat ((thanh dat) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ly nang ((ma hoi) or (mai hoi)). hieu va cac thuc vat ((thanh dat) OR (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang ((ma hoi) or (mai hoi)). hieu va cac thuc vat ((thanh dat) OR (thanh hai)) cua tre*.