Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
thu sach » tu sach, thuat sach, thuoc sach
dinh dai » dinh dat, sinh dai, dinh dao
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chet » va chiet, va che, va chat
duoc va » nuoc va, duc va, duoc ma
va dinh » van dinh, va kinh, va tinh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu va chet duoc va dinh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va chet duoc va dinh dai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va chet duoc va dinh dai ((cua tre) or (cua te))*.