Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thanh gi » thanh nghi, thanh gian, thanh hai
va thanh » gia thanh, ban thanh, va tinh
dua tren » dung tren
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
xuc va » duc va, tuc va, luc va
gi dua » gian dua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((dang xay) or (nang x)) hoi. hieu ((ve cham) OR (vu cham)) xuc va thanh gi dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((dang xay) OR (nang x)) hoi. hieu ((ve cham) OR (vu cham)) xuc va thanh gi dua tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((dang xay) or (nang x)) hoi. hieu ((ve cham) OR (vu cham)) xuc va thanh gi dua tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((dang xay) or (nang x)) hoi. hieu ((ve cham) OR (vu cham)) xuc va thanh gi dua tren*.