Perhaps you should try some spelling variations:
thang dau » hang dau, xang dau, thanh dat
ve triet » va trien, su triet
va thanh » gia thanh, ban thanh, va tinh
ke thang » ke trang, le thang, ke thuong
hieu ke » hieu kem, chieu ke, hieu ky
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va danh, ban hanh
nang xa » lang xa, nang ma, mang xa
vu sach » vu bach, su sach, vu khach
ki ve » ke ve, gi ve, vi ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty ((nang xa) OR (nang x)) hoi. hieu ke thang dau ((va hanh) or (va thanh)) ki ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (nang x)) hoi. hieu ke thang dau ((va hanh) OR (va thanh)) ki ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((nang xa) OR (nang x)) hoi. hieu ke thang dau ((va hanh) or (va thanh)) ki ve triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((nang xa) OR (nang x)) hoi. hieu ke thang dau ((va hanh) or (va thanh)) ki ve triet*.