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