Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
vien nam » viet nam, van nam, hien nay
vien dai » hien dai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
xuc lap » tuc lap, truc lap
vat cua » mat cua, bat cua, dat cua
cua tre » cua te, cuu tre, cua triet

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 nam) OR (vien dai)) xuc lap trinh vat 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 nam) OR (vien dai)) xuc lap trinh vat 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 nam) OR (vien dai)) xuc lap trinh vat cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. nhieu ((vien nam) OR (vien dai)) xuc lap trinh vat cua tre*.