Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
tham tuc » tham thuc, thai tuc, nham thuc
dua tren » dung tren
hang tai » hang va
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
va tham » van tham, va cham, va thuat
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
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: tu sach ky ((hang tai) OR (dung tai)) hoi. hieu va tham tuc va thanh lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((hang tai) OR (dung tai)) hoi. hieu va tham tuc va thanh lap ((dua tren) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((hang tai) OR (dung tai)) hoi. hieu va tham tuc va thanh lap ((dua tren) or (cua te))*".