Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vai cua » hai cua, lai cua, bai cua
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
sach tu » sach thu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach tu) OR (cach tu)) nang xa hoi. hieu ve cac duc van hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tu) OR (cach tu)) nang xa hoi. hieu ve cac duc van hanh ((vai cua) OR (dai cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach tu) OR (cach tu)) nang xa hoi. hieu ve cac duc van hanh ((vai cua) or (dai cua)) te*".