Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
nang hoat » nang hoa, trang hoat, hang hoa
vu khach » vu khanh, vu khac, vay khach
hoat hoc » hoa hoc, hoat ho, khoa hoc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, ve triet
co sach » bo sach, cuon sach, hoc sach
van bac » van ban, van bao, van hac
su tien » su kien, su hien, tu tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (co sach)) ky nang hoat hoc. hieu van bac duc va thanh lam ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (co sach)) ky nang hoat hoc. hieu van bac duc va thanh lam ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (co sach)) ky nang hoat hoc. hieu van bac duc va thanh lam ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (co sach)) ky nang hoat hoc. hieu van bac duc va thanh lam ((su triet) OR (su tien))*.