Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cham duc » pham duc, cham soc, pham duy
hanh le » thanh le, hanh ve, hanh de
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tu sach » thu sach, te sach, vu sach
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
tu cach » tu cac
le su » ve su, le vu, ly su
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 (tu cach))) or (su sach)) tu nang x hoi. hieu vu cham duc va hanh le su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (tu cach))) OR (su sach)) tu nang x hoi. hieu vu cham duc va hanh le su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (tu cach))) or (su sach)) tu nang x hoi. hieu vu cham duc va hanh le su triet".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (tu cach))) or (su sach)) tu nang x hoi. hieu vu cham duc va hanh le su triet*.