Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
kho tang » cao tang
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
truc va » thuc va, thuc vat, trung va
tuc va » thuc va, tuc xa, duc va
su sac » su sach, su cac, su xac
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa
ve hoa » ve khoa, ve hoat, va 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 sac ((ky tang) OR (kho tang)) ma hoi. hieu ve cam ((tuc va) or (truc va)) thanh ve hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky tang) OR (kho tang)) ma hoi. hieu ve cam ((tuc va) OR (truc va)) thanh ve hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) OR (kho tang)) ma hoi. hieu ve cam ((tuc va) or (truc va)) thanh ve hoa viet".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) OR (kho tang)) ma hoi. hieu ve cam ((tuc va) or (truc va)) thanh ve hoa viet*.