Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
danh gi » danh gia, danh di, danh giao
sac ky » cac ky, sai ky
gi va » bi va, gi la, gi ta

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 ty) or (sac ky)) nang xa hoi. ((hieu ve) or (hieu qua)) cam duc va danh gi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sac ky)) nang xa hoi. ((hieu ve) OR (hieu qua)) cam duc va danh gi va trien.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sac ky)) nang xa hoi. ((hieu ve) or (hieu qua)) cam duc va danh gi va trien*.