Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
va hanh » van hanh, va danh, ban hanh
cam tu » cam thu, nam tu, dam tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. ((lieu va) or (hieu va)) cam tu ((va thanh) or (va hanh)) ky su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. ((lieu va) OR (hieu va)) cam tu ((va thanh) OR (va hanh)) ky su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. ((lieu va) or (hieu va)) cam tu ((va thanh) or (va hanh)) ky su triet*.