Perhaps you should try some spelling variations:
tinh vinh » tinh ninh, tinh binh, tinh hinh
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
vinh cua » sinh cua, tinh cua, dinh cua
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
vuc van » duc van, thuc van, chuc van
luc van » luoc van, luu van, duc van
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 cac) or (thu sach)) ky nang xa hoi. hieu van cam ((vuc van) OR (luc van)) tinh vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (thu sach)) ky nang xa hoi. hieu van cam ((vuc van) OR (luc van)) tinh vinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (thu sach)) ky nang xa hoi. hieu van cam ((vuc van) OR (luc van)) tinh vinh cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (thu sach)) ky nang xa hoi. hieu van cam ((vuc van) OR (luc van)) tinh vinh cua tre*.