Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
nang dai » nang dau, nang tai, lang dai
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
nang du » nang tu, nang luc, nang doc
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
so sac » so sach, so dac
cua tu » cua tuc, cua cu, cua te
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky ((nang dai) or (nang du)) hoi. hieu ve cam luc van hanh thai ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky ((nang dai) OR (nang du)) hoi. hieu ve cam luc van hanh thai ((cua tu) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((nang dai) or (nang du)) hoi. hieu ve cam luc van hanh thai ((cua tu) OR (cua su))*".