Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc anh
hieu van » hieu va, thien van, lieu va
xa nhanh » xa thanh, xa khanh, day nhanh
nhanh ha » thanh hoa, thanh hai, khanh hoa
tu sach » thu sach, su sach, te sach
hoc cac » hoc cao
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ha cua » hoa cua, hai cua, nha 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) or (((hoc sach) or (hoc cac)))) ky nang ma hoi. hieu van cau tuc xa nhanh ha cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((hoc sach) OR (hoc cac)))) ky nang ma hoi. hieu van cau tuc xa nhanh ha cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((hoc sach) or (hoc cac)))) ky nang ma hoi. hieu van cau tuc xa nhanh ha cua tre*.