Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
ky danh » ky anh
ky dang » ky nang
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
vi va » vi van, vai va, vu va

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 hoach)) ((ky danh) OR (ky dang)) xay hoi. hieu va cac xuc va hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ((ky danh) OR (ky dang)) xay hoi. hieu va cac xuc va hanh vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ((ky danh) OR (ky dang)) xay hoi. hieu va cac xuc va hanh vi va trien".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ((ky danh) OR (ky dang)) xay hoi. hieu va cac xuc va hanh vi va trien*.