Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tay dung » xay dung, tac dung, tay nung
hang tai » hang va, dung tai
thuc ban » thuoc ban, thuc dan, thu ban
truc ban » truc dan, truc van, truoc bang
sach tay » xach tay, sach hay, sach nay
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
xay hoi » tay hoi, cay phoi, gay thoi
va cham » va chat, va tham
tai su » tai so, tai tu, lai su

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 tay dung ((xay hoi) OR (xa hoi)). hieu va cham ((truc ban) or (thuc ban)) hang tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tay dung ((xay hoi) OR (xa hoi)). hieu va cham ((truc ban) OR (thuc ban)) hang tai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tay dung ((xay hoi) OR (xa hoi)). hieu va cham ((truc ban) or (thuc ban)) hang tai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach tay dung ((xay hoi) OR (xa hoi)). hieu va cham ((truc ban) or (thuc ban)) hang tai su triet*.