Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hieu van » hieu va, thien van, lieu va
van chao » van chat, van hao, van cho
dinh dai » dinh dat, sinh dai, dinh dao
nang xa » nang x, lang xa, nang ma
chao tu » chao xu, cho tu, cao tu
va dinh » van dinh, va kinh, va tinh
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
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) OR (thuoc sach)) y nang xa hoi. hieu van chao tu va dinh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang xa hoi. hieu van chao tu va dinh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang xa hoi. hieu van chao tu va dinh dai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang xa hoi. hieu van chao tu va dinh dai ((cua tre) or (cua te))*.