Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
nang mai » nang ma, nang tai, lang mai
cam duc » cam xuc, cao duc, nam duoc
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
hoc sac » hoc sach, hoc cac, hoc mac
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sac ky » cac ky, sai ky
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: hoc sac ky nang mai hoi. hieu ve ((cam duc) OR (pham duc)) va danh vi ((cua te) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang mai hoi. hieu ve ((cam duc) OR (pham duc)) va danh vi ((cua te) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang mai hoi. hieu ve ((cam duc) OR (pham duc)) va danh vi ((cua te) or (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang mai hoi. hieu ve ((cam duc) OR (pham duc)) va danh vi ((cua te) or (va tuyen))*.