Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
doanh va » doan va, doanh tai, doanh cua
hanh va » hang va, hanh vi
danh va » anh va, dan va, dang va
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
co duc » co duoc, cao duc, do duc
cua tu » cua tuc, cua su, cua cu
va co » vo co

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 tru nang xa hoi. hieu va co duc va ((((danh va) OR (doanh va))) or (hanh va)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tru nang xa hoi. hieu va co duc va ((((danh va) OR (doanh va))) OR (hanh va)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tru nang xa hoi. hieu va co duc va ((((danh va) OR (doanh va))) or (hanh va)) cua tu".
• Adding a wildcard symbol may retrieve word variants: thu sach tru nang xa hoi. hieu va co duc va ((((danh va) OR (doanh va))) or (hanh va)) cua tu*.