Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
tu triet » su triet, tu trien, cua triet
phan lap » phan dau
tu thiet » tu thien, thua thiet, cuu thiet
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
va phan » van phan, va phat, va phap
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
ho hoi » hoc hoi, hoa hoi, hoi hoi

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. hieu vu cham truc va phan lap ((tu triet) OR (tu thiet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. hieu vu cham truc va phan lap ((tu triet) OR (tu thiet))*.