Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
hanh cau » nhanh cau, hang cau, hanh cac
hieu cac » hieu luc, hieu va, hieu van
cac chat » cao chat, cac thuat, cac nha
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
tu tieng » luc tieng, tu tuong, tu trong
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, ban hanh

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 hanh cau hoi. hieu cac chat thuc va hanh tai ((su triet) or (tu tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh cau hoi. hieu cac chat thuc va hanh tai ((su triet) OR (tu tieng)).
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh cau hoi. hieu cac chat thuc va hanh tai ((su triet) or (tu tieng))*.