Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
van hang » van khang, van hoang, van thang
hang tai » hang va, dung tai
ky dang » ky nang, ky danh
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me 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 ky dang ((ma hoi) or (xa hoi)). hieu vien cac xuc van hang tai ((cuc tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky dang ((ma hoi) OR (xa hoi)). hieu vien cac xuc van hang tai ((cuc tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky dang ((ma hoi) or (xa hoi)). hieu vien cac xuc van hang tai ((cuc tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky dang ((ma hoi) or (xa hoi)). hieu vien cac xuc van hang tai ((cuc tre) OR (cua tre))*.