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