Perhaps you should try some spelling variations:
thuc dang » thuoc dang, thuc dan, thuc dung
nham thuc » nhan thuc, nam thuc, nham thu
dang tinh » dang dinh, dang sinh, dang vinh
nang xay » dang xay, nganh xay, nang xuan
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
su triet » su viet, su tien
ve triet » va trien
te sach » toc sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
tinh vi » trinh vi, tinh voi, tinh va

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 nang xay hoi. hieu van nham thuc dang tinh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xay hoi. hieu van nham thuc dang tinh vi ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xay hoi. hieu van nham thuc dang tinh vi ((su triet) or (ve triet))*.