Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh le » thinh le, thanh ve, thanh de
cham duc » pham duc, cham soc, pham duy
hanh le » hanh ve, hanh de, manh le
tu sach » thu sach, te sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
vu cham » va cham, vu kham, tu cham
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 (su sach)) tu nang x hoi. hieu vu cham duc va ((hanh le) OR (thanh le)) 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 le) OR (thanh le)) 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 le) OR (thanh le)) 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 le) OR (thanh le)) su triet*.