Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
van cham » van chat, van tham, va cham
van tuan » van quan, van ban, anh tuan
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
sac ky » cac ky, sai ky

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) OR (sac ky)) nang cau hoi. thien ((van cham) or (van tuan)) hoc va hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang cau hoi. thien ((van cham) OR (van tuan)) hoc va hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang cau hoi. thien ((van cham) or (van tuan)) hoc va hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang cau hoi. thien ((van cham) or (van tuan)) hoc va hanh lai cua viet*.