Perhaps you should try some spelling variations:
han thai » han tai, ban thai, van thai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
thai va » thai van
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho
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: so sach ky nang x hoi. hieu ((ve cham) or (va cham)) ((xuc va) OR (duc va)) han thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang x hoi. hieu ((ve cham) OR (va cham)) ((xuc va) OR (duc va)) han thai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. hieu ((ve cham) or (va cham)) ((xuc va) OR (duc va)) han thai va thiet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu ((ve cham) or (va cham)) ((xuc va) OR (duc va)) han thai va thiet*.