Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
hanh te » hanh tu, hanh ve, hanh de
cu thuc » cuu thuc, co thuc, cu thu
nang xa » lang xa, nang ma, mang xa
van cu » van cau, van chu, van cua
te cua » tue cua, le cua, de cua
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 ky) or (sach y)) ((nang xa) OR (nang x)) hoi. hieu van cu thuc dan hanh te cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) ((nang xa) OR (nang x)) hoi. hieu van cu thuc dan hanh te cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) ((nang xa) OR (nang x)) hoi. hieu van cu thuc dan hanh te cua tu*".