Perhaps you should try some spelling variations:
nang cap » nang cham, nang phap, hang ca
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nam luc » nang luc, nhan luc, nam thuc
va hanh » va thanh, va danh, ban hanh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 ky ((nang cap) OR (nang cao)) hoi. hieu van nam luc ((va hanh) or (van hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang cap) OR (nang cao)) hoi. hieu van nam luc ((va hanh) OR (van hanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang cap) OR (nang cao)) hoi. hieu van nam luc ((va hanh) or (van hanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang cap) OR (nang cao)) hoi. hieu van nam luc ((va hanh) or (van hanh)) tai cua tre*.