Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tu cach » tu cac
van hai » van ha, van chat, van hanh
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
van hau » van ha, van dau, van hac
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
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: ((tu cach) or (vu sach)) ky nang ma hoi. thien ((van hau) OR (van hai)) truc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (vu sach)) ky nang ma hoi. thien ((van hau) OR (van hai)) truc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (vu sach)) ky nang ma hoi. thien ((van hau) OR (van hai)) truc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (vu sach)) ky nang ma hoi. thien ((van hau) OR (van hai)) truc va hanh vai cua tre*.