Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
cua triet » cua viet, su triet, va triet
cac giao » cach giao, cac giai, ca giao
danh vai » danh sai, danh va, doanh van
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
giao va » gia va, giai va, gian va
va danh » va dinh, va dan, va hanh
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) OR (hoc sach)) ty nang o hoi. hieu va cac giao va danh vai ((cua triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ty nang o hoi. hieu va cac giao va danh vai ((cua triet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) ty nang o hoi. hieu va cac giao va danh vai ((cua triet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) ty nang o hoi. hieu va cac giao va danh vai ((cua triet) or (cua vat))*.