Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dau hoi » cau hoi, dai hoi, dan hoi
ve pham » vi pham, ve phan, ve phat
duc gia » quoc gia
v pham » vi pham, d pham
va cua » va chua, via cua, ca cua
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: su sach ky nang dau hoi. hieu ((ve pham) OR (v pham)) duc gia thanh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang dau hoi. hieu ((ve pham) OR (v pham)) duc gia thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang dau hoi. hieu ((ve pham) OR (v pham)) duc gia thanh va cua te*.