Perhaps you should try some spelling variations:
nang noi » nang doc
van hanh » van thanh, ban hanh, van anh
qua caic » qua cac, cua cac, qua hai
tu sach » thu sach, su sach, te sach
tuc van » thuc van, truc van, tuc va
qua cai » qua hai, qua cac, qua ca
sach ky » sac ky, sach y, sach ty
nang ra » nang ma, lang ra, nang ro
vi cua » vai cua, di cua
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 ky ((nang noi) or (nang ra)) hoi. hieu ((qua cai) or (qua caic)) tuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang noi) OR (nang ra)) hoi. hieu ((qua cai) OR (qua caic)) tuc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang noi) or (nang ra)) hoi. hieu ((qua cai) or (qua caic)) tuc van hanh vi cua te*.