Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
kho tang » cao tang
tu sach » thu sach, su sach, te sach
va phan » van phan, va phat, va phap
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
va han » van han, va hanh, va hang
tai va » thai va, mai va, tri 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: tu sach ((ky tang) or (kho tang)) xa hoi. hieu ve cham xuc ((va han) OR (va phan)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (kho tang)) xa hoi. hieu ve cham xuc ((va han) OR (va phan)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) or (kho tang)) xa hoi. hieu ve cham xuc ((va han) OR (va phan)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) or (kho tang)) xa hoi. hieu ve cham xuc ((va han) OR (va phan)) tai va thiet*.