Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, vu khach
may hoi » may thoi, tay hoi, mai hoi
va cam » va cham, va cac, va cao
y mang » cay mang
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, ve cai

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) or (vu sach)) y mang may hoi. hieu ((ve cam) or (va cam)) thuc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y mang may hoi. hieu ((ve cam) OR (va cam)) thuc dan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y mang may hoi. hieu ((ve cam) or (va cam)) thuc dan hanh vi cua tre*.