Perhaps you should try some spelling variations:
nhieu vien » nhieu viec, nhiet dien, thieu nien
trinh ve » trinh he, trinh va, trinh vi
va trinh » van trinh, va tinh, lap trinh
cac duc » cao duc, cac dac, cac nuoc
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang xa hoi. nhieu vien ((cac duc) OR (cac du)) va trinh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. nhieu vien ((cac duc) OR (cac du)) va trinh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. nhieu vien ((cac duc) OR (cac du)) va trinh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. nhieu vien ((cac duc) OR (cac du)) va trinh ve cua tre*.