Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach thu)) nang ma hoi. lieu va cac luc ((va hanh) or (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach thu)) nang ma hoi. lieu va cac luc ((va hanh) OR (va tinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach thu)) nang ma hoi. lieu va cac luc ((va hanh) or (va tinh)) vi cua tre*.