Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach hoi » sach doi, sach moi, cach thoi
thuoc va » thuc va, thuoc ma, thuong va
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi ban » hoi dan, hoi bai, doi ban
phap va » phap vat, pham van, phap day
pham va » pham van, pham ma, pham tai
va hoi » xa hoi, va hoc, va hoa

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 hoi tap, nghien cuu mon hoc thanh dong thuoc va hoi ban ((phap va) or (pham va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoi tap, nghien cuu mon hoc thanh dong thuoc va hoi ban ((phap va) OR (pham va)).
• Adding a wildcard symbol may retrieve word variants: te sach hoi tap, nghien cuu mon hoc thanh dong thuoc va hoi ban ((phap va) or (pham va))*.