Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
viet van » viet nam, viet anh, viet ha
viet va » viet ha, tiet va, viet a
duc lap » doc lap, duc lai, duc lam
tu cach » tu cac
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
va cham » va chat, va tham
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 cach) or (su sach)) ky nang x hoi. hieu va cham duc lap trinh ((viet va) OR (viet van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang x hoi. hieu va cham duc lap trinh ((viet va) OR (viet van)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang x hoi. hieu va cham duc lap trinh ((viet va) OR (viet van)) triet*".