Perhaps you should try some spelling variations:
nang doc » nang luc
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
qua cac » cua cac
nang ra » nang ma, lang ra, nang ro
tuc van » thuc van, truc van, tuc va
vi cua » vai cua, di cua
qua ca » qua cua, qua cai, quan cau
cua te » cua tu

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 ((nang doc) or (nang ra)) hoi. hieu ((qua ca) or (qua cac)) tuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang doc) OR (nang ra)) hoi. hieu ((qua ca) OR (qua cac)) tuc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang doc) or (nang ra)) hoi. hieu ((qua ca) or (qua cac)) tuc van hanh vi cua te*.