Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, cua vat, cua dieu
su sach » so sach
vu sach » vu bach, vu khach
tu nang » tru nang, tu nong, tu nano
cao hoi » cau hoi, co hoi, cao hoc
cac duc » cac du, cao duc, cac dac

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