Perhaps you should try some spelling variations:
phuc may » hoc may, chua may, truc may
tinh vai » tinh va, tinh hai, tinh bai
su sach » so sach, vu sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
khu may » chu may, chua may
vai cua » dai cua, hai cua, lai cua
ly van » ly va, ly von, lo van
ve cac » va cac, vien cac
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: su sach ((ly van) or (le van)) xay hoi. hieu ve cac ((khu may) OR (phuc may)) tinh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly van) OR (le van)) xay hoi. hieu ve cac ((khu may) OR (phuc may)) tinh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly van) or (le van)) xay hoi. hieu ve cac ((khu may) OR (phuc may)) tinh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly van) or (le van)) xay hoi. hieu ve cac ((khu may) OR (phuc may)) tinh vai cua te*.