Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
kinh lai » kinh hai, minh lai, tinh lai
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
ty hang » ly hang, thi hang, thu hang
van lam » van nam
va kinh » va tinh, qua kinh
cuu tre » cua tre, cau tren
lam xuc » cam xuc, lam duoc
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty xang) or (ty hang)) xa hoi. hieu van lam xuc va kinh lai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty xang) OR (ty hang)) xa hoi. hieu van lam xuc va kinh lai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty xang) or (ty hang)) xa hoi. hieu van lam xuc va kinh lai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty xang) or (ty hang)) xa hoi. hieu van lam xuc va kinh lai ((cuu tre) OR (cau treo))*.