Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
nang can » nang ban, nang cap, nang cai
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
vai va » mai va, dai va, hai va
thiet » thieu

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