Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
thu sach » tu sach, thuat sach, thuoc sach
su sach » so sach, vu sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
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 nuoc 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 nuoc 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 nuoc va danh vi va thiet*.