Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, xuc ban
van lam » van nam
van cam » van nam, van cau, van dam
tu sach » thu sach, su sach, te sach
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
cuu tre » cua tre, cau tren, cau treo
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 ((tu nang) or (tu nong)) xa hoi. hieu ((van cam) OR (van lam)) xuc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nong)) xa hoi. hieu ((van cam) OR (van lam)) xuc van hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) or (tu nong)) xa hoi. hieu ((van cam) OR (van lam)) xuc van hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tu nong)) xa hoi. hieu ((van cam) OR (van lam)) xuc van hanh vi cuu tre*.