Perhaps you should try some spelling variations:
thuc dao » thuc dan, thuc day, chuc dao
can cau » van cau, ban cau, ca cau
cac mau » cam mau, sach mau
dao dan » dao van, cao dang, dao dong
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoc » co hoc, cho hoc, chat hoc
va am » va lam, 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: te sach ky nang cao hoc. hieu ((ve am) OR (va am)) thuc dao dan ((cac mau) or (can cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cao hoc. hieu ((ve am) OR (va am)) thuc dao dan ((cac mau) OR (can cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoc. hieu ((ve am) OR (va am)) thuc dao dan ((cac mau) or (can cau)) tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoc. hieu ((ve am) OR (va am)) thuc dao dan ((cac mau) or (can cau)) tren*.