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 hoc » cach hoc, sach hoi, mach hoc
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va phap » va phat, ban phap
phap va » phap vat, pham va, pham van
va hoi » xa hoi, va hoa
va hoc » van hoc

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