Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tham xuc » tham nuoc, tham thuc, pham duc
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
xuc va » duc va, tuc va, luc va
vi va » vi van, vai va, vu 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) or (thu sach)) ((ky lang) or (ky tang)) xa hoi. hieu va tham xuc va danh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va tham xuc va danh vi va thiet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ((ky lang) or (ky tang)) xa hoi. hieu va tham xuc va danh vi va thiet*.