Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac xuc » cam xuc, chat xuc, cac cuoc
thi cuu » thi huu, thi cu, thi cua
thi cuc » tai cuc
va dau » va dao

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