Perhaps you should try some spelling variations:
thi hanh » thi thanh
toc sach » hoc sach, doc sach, thuoc sach
hanh cam » hanh cham, hanh lam, hanh nam
va dinh » van dinh, va kinh, va tinh
dinh vu » dich vu, dinh ve, dinh cu
xuc va » duc va, tuc va, luc va
vu va » vu van, tu va, su va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ((tu nano) or (truc nano)) xa hoi. thi hanh cam xuc va dinh vu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((tu nano) OR (truc nano)) xa hoi. thi hanh cam xuc va dinh vu va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((tu nano) or (truc nano)) xa hoi. thi hanh cam xuc va dinh vu va thiet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((tu nano) or (truc nano)) xa hoi. thi hanh cam xuc va dinh vu va thiet*.