Perhaps you should try some spelling variations:
thanh loc » thanh loi, thanh hoc, thanh long
thu sach » thuat sach, thuoc sach, thu hoach
xanh tai » hanh tai, anh tai, vanh tai
thi nang » thi cong, ki nang, thi hanh
thi lan » thi hanh, thi lien
tai cuu » tai cuc, tai buu, tai cua
va xanh » va hanh, va danh, va anh
cuu tre » cua tre, cau tren, cau treo
thi van » thi hanh
nang xa » nang x, lang xa, nang ma
tu sach » su sach, te sach, tu cach
loc va » hoc va, luc va

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 (tu sach)) thi nang xa hoi. ((thi van) OR (thi lan)) thanh loc va xanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) thi nang xa hoi. ((thi van) OR (thi lan)) thanh loc va xanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) thi nang xa hoi. ((thi van) OR (thi lan)) thanh loc va xanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) thi nang xa hoi. ((thi van) OR (thi lan)) thanh loc va xanh tai cuu tre*.