Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thu nang » thi nang, thu hang, thu bang
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) thu nang xa hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thu nang xa hoi. hieu ve cac ((xuc va) OR (duc va)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) thu nang xa hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cuu tre*.