Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
trinh vi » trinh va, trinh ve, trinh viet
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao
cua tu » cua tuc, cua su, cua cu

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 sach ky nang xa hoi. lieu va cao ((xuc va) OR (tuc va)) trinh vi ((cua tu) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. lieu va cao ((xuc va) OR (tuc va)) trinh vi ((cua tu) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va cao ((xuc va) OR (tuc va)) trinh vi ((cua tu) or (cau tren))*.