Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
thai cua » than cua, tai cuc, tri cua
tang tai » hang tai, dung tai, sang tao
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
nam luc » nang luc, nhan luc, nam thuc
sach ky » sac ky, sach y, sach ty
va nam » van nam, ha nam, va nay

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 cai) or (tang tai)) hoi. lieu va nam luc ((va hanh) or (van hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang cai) OR (tang tai)) hoi. lieu va nam luc ((va hanh) OR (van hanh)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang cai) or (tang tai)) hoi. lieu va nam luc ((va hanh) or (van hanh)) thai cua tre*.