Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
su triet » su viet, su tien, ve triet
trang va » tran van, hang va
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
sach 2 » sach y
ma hoi » mai hoi, xa hoi, me hoi
2 nang » v nang
dam su » dan su, da su, dat su
ve cam » ve cham, ve cac, va cam

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 2 nang ((ma hoi) OR (ma hoa)). hieu ve cam ((trang va) or (thuc va)) thanh dam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang ((ma hoi) OR (ma hoa)). hieu ve cam ((trang va) OR (thuc va)) thanh dam su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 2 nang ((ma hoi) OR (ma hoa)). hieu ve cam ((trang va) or (thuc va)) thanh dam su triet".
• Adding a wildcard symbol may retrieve word variants: su sach 2 nang ((ma hoi) OR (ma hoa)). hieu ve cam ((trang va) or (thuc va)) thanh dam su triet*.