Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
quan vai » quan vi, quan tai, quan hai
van quan » van ban
hieu van » hieu va, thien van, lieu va
mang xa » lang xa, mang may, dang xay
cao duc » dao duc, cao suc, giao duc
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
y mang » cay mang
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: ((thu sach) or (su sach)) y mang xa hoi. hieu van ((pham duc) or (cao duc)) van quan vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) y mang xa hoi. hieu van ((pham duc) OR (cao duc)) van quan vai cua te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) y mang xa hoi. hieu van ((pham duc) or (cao duc)) van quan vai cua te*.