Perhaps you should try some spelling variations:
nang doc » nang luc
van hanh » van thanh, ban hanh, van anh
qua cham » qua hai, qua cac, va cham
te sach » toc sach
tuc van » thuc van, truc van, tuc va
qua cam » qua cac, qua ca, qua cai
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: te sach ky ((nang doc) or (nang ra)) hoi. hieu ((qua cam) or (qua cham)) tuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang doc) OR (nang ra)) hoi. hieu ((qua cam) OR (qua cham)) tuc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang doc) or (nang ra)) hoi. hieu ((qua cam) or (qua cham)) tuc van hanh vi cua te*.