Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc thanh » hoc nhanh, hoan thanh, ha thanh
sach hoc » cach hoc, sach hoi, mach hoc
hoc phan » hoc dan, hoc pho
thuoc va » thuc va, thuoc ma, thuong va
te sach » toc sach
cuu mon » cuu mo, cuu mot, cuu cong
va phap » va phat, ban phap
phap va » phap vat, pham va, pham van
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 hoc tap, nghien cuu mon ((hoc thanh) OR (hoc phan)) cong thuoc va hoi va phap va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cuu mon ((hoc thanh) OR (hoc phan)) cong thuoc va hoi va phap va".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu mon ((hoc thanh) OR (hoc phan)) cong thuoc va hoi va phap va*.