Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
thanh dai » thanh hai, thanh tai, thanh dat
mai khoi » mai khoa, tai khoa, cac khoi
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y nang ((ma hoi) or (mai khoi)). hieu va nham thuc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang ((ma hoi) OR (mai khoi)). hieu va nham thuc va thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach y nang ((ma hoi) or (mai khoi)). hieu va nham thuc va thanh dai cua tre*.