Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
luc va » tuc va, loc va
anh ve » hanh ve, anh va, anh viet
ve cau » ke cau, va cau, ve cac

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) or (hoc sach)) ky tang xa hoi. hieu ve chat ((luc va) or (duc va)) anh ve cau tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) ky tang xa hoi. hieu ve chat ((luc va) OR (duc va)) anh ve cau tao.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (hoc sach)) ky tang xa hoi. hieu ve chat ((luc va) or (duc va)) anh ve cau tao*.