Perhaps you should try some spelling variations:
huu them » huu thu, huu thuc, huu liem
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac dac
dao thi » do thi, dan thi, dang thi
huu tre » huu tri, cuu tre, huu tien
va dao » ca dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (te sach)) ly nang xa hoi. lieu va cac duc va dao thi ((huu tre) OR (huu them))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (te sach)) ly nang xa hoi. lieu va cac duc va dao thi ((huu tre) OR (huu them))~".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (te sach)) ly nang xa hoi. lieu va cac duc va dao thi ((huu tre) OR (huu them))*.