Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
thi ban » thi lan, tai ban, tri ban
ban thi » dan thi, van thi, can thi
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
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: so sach y ((mang xa) or (nang ma)) hoi. hieu van ban thi ban ((danh di) OR (xanh di)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((mang xa) OR (nang ma)) hoi. hieu van ban thi ban ((danh di) OR (xanh di)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((mang xa) or (nang ma)) hoi. hieu van ban thi ban ((danh di) OR (xanh di)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach y ((mang xa) or (nang ma)) hoi. hieu van ban thi ban ((danh di) OR (xanh di)) cua te*.