Perhaps you should try some spelling variations:
thanh te » thanh ve, thanh de, thanh le
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
luu van » cuu van, luu hanh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac
te cua » tue cua, le cua, de cua
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach ty)) nang ma hoa. hieu ve cau ((luu van) OR (luan van)) thanh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) nang ma hoa. hieu ve cau ((luu van) OR (luan van)) thanh te cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach ty)) nang ma hoa. hieu ve cau ((luu van) OR (luan van)) thanh te cua tre*".