Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
kinh lai » kinh hai, minh lai, tinh lai
ty hang » ly hang, thi hang, thu hang
van lam » van nam
lai cua » dai cua, hai cua, lai chau
xuc va » tuc va, luc va, xac va
cua te » cua tu

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) OR (duc va)) kinh lai cua te~.
• 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) OR (duc va)) kinh lai cua te.
• 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) OR (duc va)) kinh lai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty xang) or (ty hang)) xa hoi. hieu van lam ((xuc va) OR (duc va)) kinh lai cua te*.