Perhaps you should try some spelling variations:
sach tham » sach nha
chat thuc » thuat thuc, nhan thuc, chat thai
hang cau » hang dau, hang ca, nhung cau
hanh dai » hanh tai, hanh dao, vanh dai
hieu ca » hieu cac, hieu cua, hieu va
ca chat » cao chat, cac chat, va chat
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, ban hanh
su tien » su kien, su hien, tu tieng
dai su » dai sua, dai so, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach tham) or (sach thieu)) hang cau hoi. hieu ca chat thuc va hanh dai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tham) OR (sach thieu)) hang cau hoi. hieu ca chat thuc va hanh dai su tien.
• Adding a wildcard symbol may retrieve word variants: thu ((sach tham) or (sach thieu)) hang cau hoi. hieu ca chat thuc va hanh dai su tien*.