Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh toan » thanh hoa, thanh san, tinh toan
toan cua » than cua, tan cua, doanh cua
va thanh » gia thanh, ban thanh, va tinh
chang xu » chang xue, chao xu, thong xu
hieu vu » hieu va, hieu ve, hieu su
vu chai » vu hai, vu cham, vu phai
chai tu » cai tu, choi tu, chay tu
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, hang nxb

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (su sach)) ly ((hang x) OR (chang xu)) hoi. hieu vu chai tu va thanh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (su sach)) ly ((hang x) OR (chang xu)) hoi. hieu vu chai tu va thanh toan cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (su sach)) ly ((hang x) OR (chang xu)) hoi. hieu vu chai tu va thanh toan cua tre*".