Perhaps you should try some spelling variations:
thuc va » thuc vat, thuc dan, thuc day
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
can cau » van cau, ban cau, ca cau
cac cau » cac mau, bac cau, ca cau
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
tuc va » truc va, tuc xa, duc va
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang cao hoi. hieu ve cac ((tuc va) OR (thuc va)) dan ((cac cau) or (can cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cao hoi. hieu ve cac ((tuc va) OR (thuc va)) dan ((cac cau) OR (can cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cao hoi. hieu ve cac ((tuc va) OR (thuc va)) dan ((cac cau) or (can cau)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cao hoi. hieu ve cac ((tuc va) OR (thuc va)) dan ((cac cau) or (can cau)) tren*.