Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
nam duoc » nam thuoc, da duoc, dat duoc
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
duoc va » nuoc va, duc va, duoc ma
su sac » su cac, su xac
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) OR (su sach)) ky lang xa hoi. hieu van nam duoc va thanh va ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky lang xa hoi. hieu van nam duoc va thanh va ((cua tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su sach)) ky lang xa hoi. hieu van nam duoc va thanh va ((cua tre) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su sach)) ky lang xa hoi. hieu van nam duoc va thanh va ((cua tre) or (cua tu))*.