Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
tu nang » tru nang, tu nong, tu nano
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
x hoi » xa hoi, o hoi, x ho
ly su » ly du, ly so, ly tu

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)) tu nang x hoi. hieu vu cham duc va hanh ((ly su) OR (ky su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tu nang x hoi. hieu vu cham duc va hanh ((ly su) OR (ky su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) tu nang x hoi. hieu vu cham duc va hanh ((ly su) OR (ky su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) tu nang x hoi. hieu vu cham duc va hanh ((ly su) OR (ky su)) triet*.