Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
hanh hai » thanh hai, nhanh hai, hang hai
sach thu » sach thue, sach thieu, sach tham
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
mang xa » lang xa, mang may, dang xay
ve cac » va cac, vien cac

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 thu ((mang xa) or (nang x)) hoi. hieu ve cac duc va hanh hai ((cua viet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu ((mang xa) OR (nang x)) hoi. hieu ve cac duc va hanh hai ((cua viet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach thu ((mang xa) or (nang x)) hoi. hieu ve cac duc va hanh hai ((cua viet) or (su triet))*.