Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thi hanh » thi thanh
hanh cau » nhanh cau, hang cau, hanh cac
hieu cao » chieu cao, hieu cac, hieu ca
chat tuc » chat xuc, luat tuc, chat huu
su triet » su viet, su tien, ve triet
sach thi » sach thu, sach tai, sach thieu
so viet » hoc viet
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh

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

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