Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
dang xay » dang van, van xay
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
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
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » hieu qua
vai hoa » van hoa, va hoa, dai 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 ky dang xay hoi. ((hieu va) or (lieu va)) nham thuc ban hanh vai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. ((hieu va) OR (lieu va)) nham thuc ban hanh vai hoa viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. ((hieu va) or (lieu va)) nham thuc ban hanh vai hoa viet*.