Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
nam thuc » nam thuoc, am thuc, nam thu
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » su sach, te sach, tu cach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
di hoa » dai hoa, doi hoa, do hoa
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 sach) or (thu sach)) ky nang ((ma hoi) or (mai khoi)). hieu van nam thuc va hanh di hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((ma hoi) OR (mai khoi)). hieu van nam thuc va hanh di hoa viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((ma hoi) or (mai khoi)). hieu van nam thuc va hanh di hoa viet*.