Perhaps you should try some spelling variations:
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
cac thuc » cach thuc, cac thu, can thuc
vat danh » va danh, van danh, luat danh
tu sach » thu sach, su sach, te sach
qua cac » cua cac
danh vi » hanh vi, dinh vi, danh di
cua tu » cua tuc, cua su, cua cu

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 y ((lang van) or (dang van)) hoc. hieu qua cac thuc vat danh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang van) OR (dang van)) hoc. hieu qua cac thuc vat danh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang van) or (dang van)) hoc. hieu qua cac thuc vat danh vi ((cua te) or (cua tu))*.