Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, cam thu, can thuc
danh doi » danh di, thanh doi, dung doi
vat danh » va danh, van danh, luat danh
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
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: so sach y ((nang xa) or (dang xay)) hoi. hieu van ((cam thuc) or (nam thuc)) vat danh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (dang xay)) hoi. hieu van ((cam thuc) OR (nam thuc)) vat danh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (dang xay)) hoi. hieu van ((cam thuc) or (nam thuc)) vat danh doi cua tu*.