Perhaps you should try some spelling variations:
van chinh » va chinh, lan chinh, van thinh
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, tu cach
nam qua » nam quan, nam cua, nam mua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
te sach » toc sach
vi cua » vai cua, di cua
va nam » van nam, ha nam, va nay
x hoi » xa hoi, o hoi, x ho

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 (te sach)) ky nang x hoi. hieu va nam qua ((va trinh) or (van chinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. hieu va nam qua ((va trinh) OR (van chinh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang x hoi. hieu va nam qua ((va trinh) or (van chinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang x hoi. hieu va nam qua ((va trinh) or (van chinh)) vi cua tre*.