Perhaps you should try some spelling variations:
tat thanh » tai thanh, ta thanh, tat thang
thanh dat » thanh san, thanh hai, thanh van
toc sach » hoc sach, doc sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
thuc tat » thuc vat, thuc tap, thuc tai
dai hoi » dai hoc, dai hai, dai moi
hieu va » lieu va, hieu qua
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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 y nang ((ma hoi) or (dai hoi)). hieu va cam thuc tat thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((ma hoi) OR (dai hoi)). hieu va cam thuc tat thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((ma hoi) or (dai hoi)). hieu va cam thuc tat thanh dat cua tre*.