Perhaps you should try some spelling variations:
sach thanh » sach tranh, sach tham, danh thanh
sanh tham » sach tham, san pham, sinh thai
tham thai » tham tham, pham thi, tham khao
thai khi » thai nhi, phai khi, thai chi
phan khu » phan khuc, phan nhua, khuan khu
phan thi » pham thi, tran thi, phan tu
so sanh » do sanh
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 sanh tham thai khi đong luc ) or ( tu sach thanh ((phan khu) or (phan thi)) đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tham thai khi đong luc ) OR ( tu sach thanh ((phan khu) OR (phan thi)) đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tham thai khi đong luc ) or ( tu sach thanh ((phan khu) or (phan thi)) đong luc ))*.