Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
danh vai » danh sai, danh va, doanh van
sach ty » sach y, sach tu, sach thu
thue va » thuc va, thuyet va, thuc vat
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
thu va » thuc va, tu va, thu ha
va cam » va cham, va cac, va cao
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: su sach ty nang o hoi. hieu va cam ((thu va) OR (thue va)) danh vai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang o hoi. hieu va cam ((thu va) OR (thue va)) danh vai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang o hoi. hieu va cam ((thu va) OR (thue va)) danh vai ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang o hoi. hieu va cam ((thu va) OR (thue va)) danh vai ((cua triet) or (va triet))*.