Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
hang cau » hang dau, hang ca, nhung cau
su triet » su viet, su tien, ve triet
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, ban hanh
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
ca chat » cac chat, va chat, ca cham
so viet » hoc viet

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

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