Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh
dua tren » dung tren
ban hang » ngan hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nam qua » nam quan, nam cua, nam mua
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang ma hoi. hieu va nam qua ((ban thanh) OR (ban hang)) vai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hoi. hieu va nam qua ((ban thanh) OR (ban hang)) vai ((dua tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ma hoi. hieu va nam qua ((ban thanh) OR (ban hang)) vai ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ma hoi. hieu va nam qua ((ban thanh) OR (ban hang)) vai ((dua tren) or (cua triet))*.