Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
cuu tre » cua tre, cau tren, cau treo
vai cuu » vai cua
va hanh » va thanh, va danh, ban hanh
truc va » thuc va, thuc vat, trung va
van hai » van ha, van chat, van phan
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) or (tang ma)) hoi. thien ((van hai) OR (van hanh)) truc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (tang ma)) hoi. thien ((van hai) OR (van hanh)) truc va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) or (tang ma)) hoi. thien ((van hai) OR (van hanh)) truc va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (tang ma)) hoi. thien ((van hai) OR (van hanh)) truc va hanh vai cuu tre*.