Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua viet » ca viet, hoa viet, cua vat
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
hieu va » lieu va, hieu qua

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 ((tu nang) OR (tu nano)) cao hoi. hieu va cac ((duc ban) or (duc van)) thanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tu nano)) cao hoi. hieu va cac ((duc ban) OR (duc van)) thanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nang) OR (tu nano)) cao hoi. hieu va cac ((duc ban) or (duc van)) thanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nang) OR (tu nano)) cao hoi. hieu va cac ((duc ban) or (duc van)) thanh vai cua viet*.