Perhaps you should try some spelling variations:
sach thanh » sach tranh, danh thanh, sach danh
sach tham » sach nha
tham thai » tham tham, pham thi, tham khao
thai khi » thai nhi, phai khi, thai chi
phan khi » phai khi, phan khu, phan phoi
phan thi » pham thi, tran thi, phan tu
so sach » so sanh, bo sach, co sach
tu sach » thu sach, su sach, te sach

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 tham thai khi đong luc ) or ( tu sach thanh ((phan khi) OR (phan thi)) đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tham thai khi đong luc ) OR ( tu sach thanh ((phan khi) OR (phan thi)) đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach tham thai khi đong luc ) or ( tu sach thanh ((phan khi) OR (phan thi)) đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach tham thai khi đong luc ) or ( tu sach thanh ((phan khi) OR (phan thi)) đong luc ))*.