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
tu sach » thu sach, su sach, te sach
hieu vu » hieu ve, hieu su, dieu vu
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: tu sach ty nang ((ho hoi) OR (hoc hoi)). ((hieu vu) or (hieu va)) cham truc van phan lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ho hoi) OR (hoc hoi)). ((hieu vu) OR (hieu va)) cham truc van phan lap va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((ho hoi) OR (hoc hoi)). ((hieu vu) or (hieu va)) cham truc van phan lap va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ho hoi) OR (hoc hoi)). ((hieu vu) or (hieu va)) cham truc van phan lap va triet*.