Perhaps you should try some spelling variations:
thanh nam » hanh nam, thanh tam, thanh pham
nang hoat » nang hoa, trang hoat, hang hoa
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hoat hoc » hoa hoc, hoat ho, khoa hoc
hieu van » hieu va, thien van, lieu va
hac duc » ha duc, thach duc, pham duc
hoc duc » hoc duoc, hoc nuoc, hoc thuc
vu sach » vu bach, su sach, vu khach
bo sach » co sach, hoc sach
nam su » nam suu, nam sau, nam so

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (bo sach)) ky nang hoat hoc. hieu van ((hac duc) or (hoc duc)) va thanh nam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (bo sach)) ky nang hoat hoc. hieu van ((hac duc) OR (hoc duc)) va thanh nam su triet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (bo sach)) ky nang hoat hoc. hieu van ((hac duc) or (hoc duc)) va thanh nam su triet*.