Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doan van » doan va, hoang van, luan van
sach kem » hanh kem
dan doan » dan toan, tan doan, van doan
thuc dan » thuc hanh, hoc dan, thuc vat
ve pham » vi pham, v pham, ve phan
van cua » vang cua, ban cua, dan cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach hay
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((((sach ky) OR (sach kem))) or (sach y)) lang xa hoi. hieu ve pham thuc dan doan van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((((sach ky) OR (sach kem))) OR (sach y)) lang xa hoi. hieu ve pham thuc dan doan van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((((sach ky) OR (sach kem))) or (sach y)) lang xa hoi. hieu ve pham thuc dan doan van cua tre*".