Perhaps you should try some spelling variations:
hoang xa » hoang ha, hoang va, hoang xuan
hieu cao » chieu cao, hieu cac, hieu ca
hanh lam » thanh lap, hanh kem, hanh va
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hang xa » hang va, hang ca, lang xa
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
lam va » nam va, dam va, lam ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((hang xa) or (hoang xa)) hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((hang xa) OR (hoang xa)) hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((hang xa) or (hoang xa)) hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va trien".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((hang xa) or (hoang xa)) hoi. hieu cao chat ((luc van) OR (duc van)) hanh lam va trien*.