Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
xa hanh » xa thanh, xa khanh, va hanh
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang ma hoi. hieu van ((((nam thuc) OR (nam tu))) or (nam thu)) xa hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ma hoi. hieu van ((((nam thuc) OR (nam tu))) OR (nam thu)) xa hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ma hoi. hieu van ((((nam thuc) OR (nam tu))) or (nam thu)) xa hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ma hoi. hieu van ((((nam thuc) OR (nam tu))) or (nam thu)) xa hanh vai cua te*.