Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
su sach » vu sach
va cham » va chat, va tham
ve chat » va chat, van chat
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, x ho

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 (so sach)) ty nang x hoi. hieu ((ve chat) or (va cham)) thuc vat hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang x hoi. hieu ((ve chat) OR (va cham)) thuc vat hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ty nang x hoi. hieu ((ve chat) or (va cham)) thuc vat hanh vi cuu tre*.