Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
giai thanh » gia thanh, gian thanh, giay thanh
thuc giai » thuoc giao, hoc giai, thuc thai
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thanh di » thanh doi, thanh de, thanh do
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
di cua » dai cua, doi cua, de cua
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: ((thu sach) or (thuat sach)) y nang o hoi. hieu van nam thuc giai thanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y nang o hoi. hieu van nam thuc giai thanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) y nang o hoi. hieu van nam thuc giai thanh di cua triet*.