Perhaps you should try some spelling variations:
xang cau » xang dau, hang cau, bang cau
su triet » su tien, ve triet
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
dua ban » dia ban, cua ban, qua ban
su viet » so viet
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, duc man
va cham » va chat, va tham
hieu va » lieu va, hieu qua

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 ty xang cau hoi. hieu va cham ((duc ban) OR (dua ban)) thanh va ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang cau hoi. hieu va cham ((duc ban) OR (dua ban)) thanh va ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang cau hoi. hieu va cham ((duc ban) OR (dua ban)) thanh va ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang cau hoi. hieu va cham ((duc ban) OR (dua ban)) thanh va ((su triet) or (su viet))*.