Perhaps you should try some spelling variations:
khoan viet » hoa viet, thon viet, han viet
hoat viet » hoa viet, hoai viet, hoang viet
thanh vo » thanh va, thanh ve, than vo
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
su sai » su tai, su hai, su dai
sai ky » sac ky
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 sai ky tang xa hoi. hieu ve cam ((thuc va) or (truc va)) thanh vo ((hoat viet) OR (khoan viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky tang xa hoi. hieu ve cam ((thuc va) OR (truc va)) thanh vo ((hoat viet) OR (khoan viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky tang xa hoi. hieu ve cam ((thuc va) or (truc va)) thanh vo ((hoat viet) OR (khoan viet))".
• Adding a wildcard symbol may retrieve word variants: su sai ky tang xa hoi. hieu ve cam ((thuc va) or (truc va)) thanh vo ((hoat viet) OR (khoan viet))*.