Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
thuc dan » thuc hanh, hoc dan, thuc vat
thuc va » thuc vat, thuc day
vai cuu » vai cua
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
van hai » van ha, van chat, van hanh
dan cac » dan cach, dang cac, dan ca
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
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: vu sach ky nang ma hoi. hieu ((dan cac) or (van hai)) ((thuc va) OR (thuc dan)) hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu ((dan cac) OR (van hai)) ((thuc va) OR (thuc dan)) hanh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ma hoi. hieu ((dan cac) or (van hai)) ((thuc va) OR (thuc dan)) hanh vai cuu tre*".