Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
dan vai » dan va, dan tai, dan vat
cua tre » cua te, cuu tre, dua tren
ve cac » va cac, vien cac
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang xa hoi. hieu ve cac ((xuc va) or (luc va)) dan vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu ve cac ((xuc va) OR (luc va)) dan vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. hieu ve cac ((xuc va) or (luc va)) dan vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu ve cac ((xuc va) or (luc va)) dan vai ((cua tre) OR (cua triet))*.