Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
ha tren » hoa tren, ha tran, la tren
su sach » so sach, vu sach
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
vi ha » vu ha

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 x hoi. hieu va cam xuc ((va dan) or (ca dan)) vi ha tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang x hoi. hieu va cam xuc ((va dan) OR (ca dan)) vi ha tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang x hoi. hieu va cam xuc ((va dan) or (ca dan)) vi ha tren*.