Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
thi cuu » thi huu, thi cu, thi cua
thi cuc » tai cuc
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau

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 y nang xa hoi. lieu va ((cac tuc) or (cac toc)) va cau ((thi cuu) or (thi cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. lieu va ((cac tuc) OR (cac toc)) va cau ((thi cuu) OR (thi cuc)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. lieu va ((cac tuc) or (cac toc)) va cau ((thi cuu) or (thi cuc)) tre*.