Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
phap lap » phan lap, phap lam, phap luat
truc va » thuc va, thuc vat, trung va
va phap » va phat, ban phap
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
ty nang » ky nang, ty hang, ly nang
ho hoi » hoc hoi, hoa hoi, hoi hoi
vu cau » va cau, vu cao, cu cau

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