Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang doi » hang di, hang loi, huong doi
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
van lam » van nam
sach ty » sach y, sach tu, sach thu
lam duc » lam duoc, pham duc, nam duoc
hanh de » hanh ve, hanh kem
ty nang » ky nang, ty xang, ty hang
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty nang ((o hoi) OR (o hoc)). hieu van lam duc va ((hanh de) or (hang doi)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang ((o hoi) OR (o hoc)). hieu van lam duc va ((hanh de) OR (hang doi)) ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang ((o hoi) OR (o hoc)). hieu van lam duc va ((hanh de) or (hang doi)) ve triet*".