Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van hoc » van hoa
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua duc » cua tuc, cua nuoc, cua quoc
cua su » qua su
x hoi » xa hoi, o hoi, x ho
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu van hoc nuoc va tinh va ((cua su) or (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu van hoc nuoc va tinh va ((cua su) OR (cua duc)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu van hoc nuoc va tinh va ((cua su) or (cua duc))*.