Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu van) or (hieu va)) cam truc van hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu van) OR (hieu va)) cam truc van hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu van) or (hieu va)) cam truc van hanh va su triet*.