Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
tai nang » thi nang, dai nang, tap nang
ban hanh » ban hang
tai lang » tai cong, thi lan, tai san
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lam cuc » lam cua, pham cuc
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ((tai nang) OR (tai lang)) xa hoi. hieu van ((lam cuc) or (lam duoc)) ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tai nang) OR (tai lang)) xa hoi. hieu van ((lam cuc) OR (lam duoc)) ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tai nang) OR (tai lang)) xa hoi. hieu van ((lam cuc) or (lam duoc)) ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tai nang) OR (tai lang)) xa hoi. hieu van ((lam cuc) or (lam duoc)) ban hanh vi cua tre*.