Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
cua triet » cua viet, va triet
truoc va » truc va, thuoc va, truong va
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
vu sach » vu bach, vu khach
su sach » so sach
y nang » ky nang, ly nang, v nang
va lam » van lam, va lap
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) y nang xa hoi. hieu va lam truoc va dan vi ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang xa hoi. hieu va lam truoc va dan vi ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang xa hoi. hieu va lam truoc va dan vi ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang xa hoi. hieu va lam truoc va dan vi ((cua triet) OR (su triet))*.