Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
tu triet » su triet, tu thiet, tu trien
phan lap » phan dau
sach ty » sach y, sach tu, sach thu
va phan » van phan, va phat, va phap
truc va » thuc va, thuc vat, trung va
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 tu » lap du

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 va phan lap tu 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 va phan lap tu 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 va phan lap tu triet*.