Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
nang mai » nang ma, nang tai, lang mai
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
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: ((thu sach) or (su sach)) ky nang mai hoi. ((hieu ve) or (hieu va)) chat xuc va hanh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang mai hoi. ((hieu ve) OR (hieu va)) chat xuc va hanh vi va thiet.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang mai hoi. ((hieu ve) or (hieu va)) chat xuc va hanh vi va thiet*.