Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cuu » van cau, van chu, van cu
hanh tu » anh tu, danh tu
ma hoi » mai hoi, xa hoi, ma hoa
tu cua » hu cua, vu cua
cua te » cua tu

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 nang ma hoi. hieu van cuu ((thuc dan) or (hoc dan)) hanh tu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu van cuu ((thuc dan) OR (hoc dan)) hanh tu cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu van cuu ((thuc dan) or (hoc dan)) hanh tu cua te*.