Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ki » sach kinh, sach bai, sach kem
ki nang » ky nang
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
ve cac » va 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 nang xa hoi. hieu ((ve cac) OR (vien cac)) duc van hanh di cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ki nang xa hoi. hieu ((ve cac) OR (vien cac)) duc van hanh di cua cu".
• Adding a wildcard symbol may retrieve word variants: te sach ki nang xa hoi. hieu ((ve cac) OR (vien cac)) duc van hanh di cua cu*.