Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
thuc van » thuc vat, thuc dan, thuc va
hieu van » hieu va, thien van, lieu va
tuc van » truc van, tuc va, duc van
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi hoa » voi hoa, vi hoc, 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 mai hoi. ((hieu ve) or (hieu van)) cam ((tuc van) OR (thuc van)) hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang mai hoi. ((hieu ve) OR (hieu van)) cam ((tuc van) OR (thuc van)) hanh vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang mai hoi. ((hieu ve) or (hieu van)) cam ((tuc van) OR (thuc van)) hanh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang mai hoi. ((hieu ve) or (hieu van)) cam ((tuc van) OR (thuc van)) hanh vi hoa viet*.