Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
va triet » va thiet, va trien, ve triet
phan lap » phan dau
van phan » van phong, van thanh, luan phan
truc van » truc va, thuc van, truc ban
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
hieu su » hieu sau, tieu su, hieu so
hoc hoi » hoc khoi, hoc hoa, hoc noi
ty nang » ky nang, ty xang, ty hang
ho hoi » hoa hoi, hoi hoi, co hoi
lap va » tap va

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 ty nang ((ho hoi) or (hoc hoi)). ((hieu su) or (hieu va)) cham truc van phan lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ho hoi) OR (hoc hoi)). ((hieu su) OR (hieu va)) cham truc van phan lap va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ho hoi) or (hoc hoi)). ((hieu su) or (hieu va)) cham truc van phan lap va triet*.