Perhaps you should try some spelling variations:
nang cam » nang cham, nang cao, nang cap
thi nang » thi cong, ki nang, thi hanh
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach ty
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
va dau » va dao
di cau » diem cau
da cau » dat cau, va cau

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 ((ma hoi) OR (mai hoi)). thi nang cam duc va dau ((di cau) or (da cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (mai hoi)). thi nang cam duc va dau ((di cau) OR (da cau)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) OR (mai hoi)). thi nang cam duc va dau ((di cau) or (da cau)) tre*".