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