Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
nang cau » nang cao, hang cau, nang dau
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
cac xuc » cam xuc, cac nuoc, chat xuc
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
cua cu » cua chu, cua cau, cua su

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. hieu ve cac xuc ((van hanh) or (ban hanh)) di cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang cau hoi. hieu ve cac xuc ((van hanh) OR (ban hanh)) di cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang cau hoi. hieu ve cac xuc ((van hanh) or (ban hanh)) di cua cu".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang cau hoi. hieu ve cac xuc ((van hanh) or (ban hanh)) di cua cu*.