Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
cham cuu » cap cuu, chat cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cuu may » cuu xay, cau may, chu may
bai cua » ban cua, dai cua, hai cua
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thuat sach)) y nang xa hoi. hieu ve cham cuu may tinh ((bai cua) OR (bai ca)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) y nang xa hoi. hieu ve cham cuu may tinh ((bai cua) OR (bai ca)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat sach)) y nang xa hoi. hieu ve cham cuu may tinh ((bai cua) OR (bai ca)) tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) y nang xa hoi. hieu ve cham cuu may tinh ((bai cua) OR (bai ca)) tre*.