Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach bai » sach dao, sach xa
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
sach ki » sach kinh, sach kem, sach doi
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
cua cu » cua chu, cua cau, cua su

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 ki) or (((sach bai) OR (cac bai)))) nang xa hoi. hieu ve cac duc van hanh di cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ki) OR (((sach bai) OR (cac bai)))) nang xa hoi. hieu ve cac duc van hanh di cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ki) or (((sach bai) OR (cac bai)))) nang xa hoi. hieu ve cac duc van hanh di cua cu".
• Adding a wildcard symbol may retrieve word variants: te ((sach ki) or (((sach bai) OR (cac bai)))) nang xa hoi. hieu ve cac duc van hanh di cua cu*.