Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ly » sach y, sach lo, sach ty
hanh vu » hanh vi, hanh va, hanh tu
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
hieu va » hieu qua
hieu ve » hieu van
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
luc va » duc va, tuc va, loc va
vu va » vu van, tu va, su va
thiet » thieu

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 ly hang xa hoi. ((((hieu ve) or (hieu va))) or (lieu va)) cau luc va hanh vu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly hang xa hoi. ((((hieu ve) OR (hieu va))) OR (lieu va)) cau luc va hanh vu va thiet.
• Adding a wildcard symbol may retrieve word variants: thu sach ly hang xa hoi. ((((hieu ve) or (hieu va))) or (lieu va)) cau luc va hanh vu va thiet*.