Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
sach kho » bach khoa, sach dao, sach nha
hanh vai » hanh va, hanh tai, hanh van
te sach » toc sach
tang ma » tang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
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: te sach kho ((tang ma) OR (mang may)) hoi. hieu va tham nuoc va ((hanh vai) or (hanh vi)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach kho ((tang ma) OR (mang may)) hoi. hieu va tham nuoc va ((hanh vai) OR (hanh vi)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach kho ((tang ma) OR (mang may)) hoi. hieu va tham nuoc va ((hanh vai) or (hanh vi)) va thiet".
• Adding a wildcard symbol may retrieve word variants: te sach kho ((tang ma) OR (mang may)) hoi. hieu va tham nuoc va ((hanh vai) or (hanh vi)) va thiet*.