Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
khanh ve » hanh ve, thanh ve, khanh v
tay lang » tai lang, tay tang, tay quang
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cua tu » cua tuc, cua su, cua te
va cau » van cau, va cac, va dau
_ lang » o lang, _ land
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tay lang) or (_ lang)) xa hoi. hieu va cau thuc dan khanh ve ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tay lang) OR (_ lang)) xa hoi. hieu va cau thuc dan khanh ve ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tay lang) or (_ lang)) xa hoi. hieu va cau thuc dan khanh ve ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tay lang) or (_ lang)) xa hoi. hieu va cau thuc dan khanh ve ((cua tu) OR (cua cu))*.