Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach tu, sach thu, xach tay
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
ca viet » va viet, co viet, hoa viet
vai ca » vai cac, vai cua, bai ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ty) OR (sach y)) ((tang ma) or (lang xa)) hoi. hieu va cac duc va thanh vai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach y)) ((tang ma) OR (lang xa)) hoi. hieu va cac duc va thanh vai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) OR (sach y)) ((tang ma) or (lang xa)) hoi. hieu va cac duc va thanh vai ca viet".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) OR (sach y)) ((tang ma) or (lang xa)) hoi. hieu va cac duc va thanh vai ca viet*.