Perhaps you should try some spelling variations:
minh thanh » dinh thanh, tinh thanh, hinh thanh
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
vu minh » vu dinh, van minh
buu tre » cuu tre
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cam vu » cam tu, cam va, cao vu
y nang » ky nang, ly 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) or (su sach)) y nang xa hoi. ((hieu ve) OR (hieu van)) cam vu minh thanh tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang xa hoi. ((hieu ve) OR (hieu van)) cam vu minh thanh tai buu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) y nang xa hoi. ((hieu ve) OR (hieu van)) cam vu minh thanh tai buu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang xa hoi. ((hieu ve) OR (hieu van)) cam vu minh thanh tai buu tre*.