Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
cham hoc » cham soc, chat hoc, cham hoi
ve triet » su triet
hanh lai » hanh lam, hanh tai, thanh lap
nang cau » nang cao, hang cau, nang dau
thien va » thien van, tien va, thien tai
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham

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 ky) OR (sach ty)) nang cau hoi. thien va cham hoc va hanh lai ((ve triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang cau hoi. thien va cham hoc va hanh lai ((ve triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang cau hoi. thien va cham hoc va hanh lai ((ve triet) or (va trien))*".