Perhaps you should try some spelling variations:
nhanh ngan » chinh ngan, thanh nhan
va nhanh » va thanh, va hanh, va nhan
duc tien » duc thien, luc tieng, thuc tien
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
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
duc tre » duoc tren
ve cac » va cac, vien cac
tac va » tac da, tac xa, tuc va

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 hoa. hieu ve cac tac va nhanh ngan ((duc tre) or (duc tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ma hoa. hieu ve cac tac va nhanh ngan ((duc tre) OR (duc tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ma hoa. hieu ve cac tac va nhanh ngan ((duc tre) or (duc tien))*.