Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
thien van » thi van
tu sach » thu sach, su sach, te sach
lam dua » lam cua, lam duoc, lam dung
cua tre » cua te, cua triet, dua tren
dua ban » dia ban, cua ban, qua ban
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
sach 2 » sach y
2 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: tu sach 2 nang xa hoi. ((hieu va) or (thien van)) lam dua ban thanh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang xa hoi. ((hieu va) OR (thien van)) lam dua ban thanh vai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach 2 nang xa hoi. ((hieu va) or (thien van)) lam dua ban thanh vai ((cua tre) or (cuu tre))*.