Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang van » hoang van, hang va
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
ky dang » ky nang, ky danh
xuc va » duc va, tuc va, luc va
vai ca » vai cac, bai ca, vai va
vu cam » vu cham, vu cao, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky dang van hoa. hieu vu cam xuc va tinh ((vai ca) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky dang van hoa. hieu vu cam xuc va tinh ((vai ca) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky dang van hoa. hieu vu cam xuc va tinh ((vai ca) or (vai cua)) viet*.