Perhaps you should try some spelling variations:
han thai » han tai, ban thai, van thai
va thieu » va thiet, va hieu, va tieu
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
thai va » thai van
vu cam » vu cham, vu cao, va cam
xuc va » tuc va, luc va, xac va

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 _ lang xa hoi. hieu vu cam ((xuc va) or (duc va)) han thai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ lang xa hoi. hieu vu cam ((xuc va) OR (duc va)) han thai va thieu.
• Adding a wildcard symbol may retrieve word variants: su sach _ lang xa hoi. hieu vu cam ((xuc va) or (duc va)) han thai va thieu*.