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