Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
vu cham » va cham, vu kham, tu cham
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
long ha » dong ha, cong ha, dong hoa
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang xa) or (long ha)) hoi. hieu vu cham ((duc van) or (luc van)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (long ha)) hoi. hieu vu cham ((duc van) OR (luc van)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) or (long ha)) hoi. hieu vu cham ((duc van) or (luc van)) hanh vi cau tren*.