Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki su

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 van ((nang ma) or (tang ma)) hoi. hieu va cam ((xuc van) or (luc van)) hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van ((nang ma) OR (tang ma)) hoi. hieu va cam ((xuc van) OR (luc van)) hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: su sach van ((nang ma) or (tang ma)) hoi. hieu va cam ((xuc van) or (luc van)) hanh vi su tien*.