Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ly quang » le quang, vu quang
hanh tai » thanh tai, hang tai, han tai
cam luc » cam xuc, cau luc
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam
x hoi » o hoi, x ho, 5 hoi

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 ly quang ((x hoi) OR (xa hoi)). hieu ve cam luc va hanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ly quang ((x hoi) OR (xa hoi)). hieu ve cam luc va hanh tai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ly quang ((x hoi) OR (xa hoi)). hieu ve cam luc va hanh tai ((cua tre) or (cuu tre))*".