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
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
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) or (lang xa)) hoi. hieu ve 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) OR (lang xa)) hoi. hieu ve 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) or (lang xa)) hoi. hieu ve cham ((xuc va) OR (luc va)) han thai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. hieu ve cham ((xuc va) OR (luc va)) han thai va thiet*.