Perhaps you should try some spelling variations:
tu thiet » tu thien, thua thiet, cuu thiet
tu triet » su triet, tu trien, cua triet
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
tu sach » thu sach, su sach, te sach
vu cham » vu kham, tu cham, qua cham
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
va cham » va chat, va tham
ho hoi » hoc hoi, hoa hoi, hoi hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ho hoi. hieu ((vu cham) OR (va cham)) truc va phan lap ((tu triet) OR (tu thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. hieu ((vu cham) OR (va 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) OR (va cham)) truc va phan lap ((tu triet) or (tu thiet))*.