Perhaps you should try some spelling variations:
giai thanh » gia thanh, gian thanh, giay thanh
thuat sach » thuat lanh, thuat san
thuc giai » thuoc giao, hoc giai, thuc thai
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thanh di » thanh doi, thanh de, thanh do
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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) or (thuat sach)) y nang x hoi. hieu van nam thuc giai thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) y nang x hoi. hieu van nam thuc giai thanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) y nang x hoi. hieu van nam thuc giai thanh di cua viet*.