Perhaps you should try some spelling variations:
nhien viet » nhin viet, nghiep viet, trien viet
viet cao » vien cao, viet co, viet ca
va trinh » van trinh, va tinh, lap trinh
cao duc » dao duc, cao suc, giao duc
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
ve cuu » ve chu, ve cua, ve cum
ve cau » ke cau, va cau, ve cac

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. nhien viet cao duc va trinh ((ve cuu) OR (ve cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. nhien viet cao duc va trinh ((ve cuu) OR (ve cau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. nhien viet cao duc va trinh ((ve cuu) OR (ve cau)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. nhien viet cao duc va trinh ((ve cuu) OR (ve cau)) tre*.