Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
dieu cuu » dieu cua, dinh cuu, dien cuc
cuu treo » cau treo, cuu tre, cu tren
so sach » so sanh, bo sach, co sach
van lam » van nam
luc va » tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (hoc sach)) ky nang van hoa. hieu van lam ((luc va) OR (duc va)) dang dieu cuu treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (hoc sach)) ky nang van hoa. hieu van lam ((luc va) OR (duc va)) dang dieu cuu treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (hoc sach)) ky nang van hoa. hieu van lam ((luc va) OR (duc va)) dang dieu cuu treo".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (hoc sach)) ky nang van hoa. hieu van lam ((luc va) OR (duc va)) dang dieu cuu treo*.