Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
cao duc » dao duc, cao suc, giao duc
vai cua » dai cua, hai cua, lai cua
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
cam duc » cam xuc, pham duc, nam duoc
va danh » va dinh, va dan, va hanh
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 ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cam duc) or (cao duc)) va danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cam duc) OR (cao duc)) va danh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cam duc) or (cao duc)) va danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cam duc) or (cao duc)) va danh vai cua te*.