Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
ban dan » ban hang, ban hanh, ban quan
cuc ban » cua ban, cac ban, cuu ban
lam cuc » lam cua, lam duoc, pham cuc
van lam » van nam
xang x » nang x
dan vi » doan vi, don vi, dan va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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)) ty xang x hoi. hieu van lam cuc ban dan vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty xang x hoi. hieu van lam cuc ban dan vi ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty xang x hoi. hieu van lam cuc ban dan vi ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty xang x hoi. hieu van lam cuc ban dan vi ((dua tren) or (cua te))*.