Perhaps you should try some spelling variations:
trinh do » trinh ky
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc
tu lap » truc lap
do cua » doi cua, co cua, de cua

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. ((hieu va) OR (hieu qua)) nam tu lap trinh do cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu va) OR (hieu qua)) nam tu lap trinh do cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu va) OR (hieu qua)) nam tu lap trinh do cua tre*.