Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh vi » hanh vi, thanh va, thanh ve
thuc dan » thuc hanh, hoc dan
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
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: thuoc sach y nang xa hoi. ((hieu ve) or (hieu va)) cau ((thuc dan) OR (thuc vat)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cau ((thuc dan) OR (thuc vat)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang xa hoi. ((hieu ve) or (hieu va)) cau ((thuc dan) OR (thuc vat)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. ((hieu ve) or (hieu va)) cau ((thuc dan) OR (thuc vat)) thanh vi cua te*.