Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
van dung » van dong, xay dung, tin dung
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cuc tre » cua tre, cuu tre, cuc thue
duc tre » duoc tren, duc tien
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 viec cac xuc van dung tai ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky dang ((ma hoi) OR (xa hoi)). hieu viec cac xuc van dung tai ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky dang ((ma hoi) or (xa hoi)). hieu viec cac xuc van dung tai ((cuc tre) OR (duc tre))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky dang ((ma hoi) or (xa hoi)). hieu viec cac xuc van dung tai ((cuc tre) OR (duc tre))*.