Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
su sach » so sach, vu sach
coc tuc » coc luc, hoc thuc, doc thuc
tinh va » tich va, trinh vat, tinh gia
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, truc va, tuc xa

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 ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc va ((tinh va) OR (trinh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu ve) OR (hieu va)) coc tuc va ((tinh va) OR (trinh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc va ((tinh va) OR (trinh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc va ((tinh va) OR (trinh van)) cua tre*.