Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
bac tuc » bac tu, bach tuoc, bac thua
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sanh)) vu nang ma hoi. ((hieu van) OR (thien van)) bac tuc xa thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) vu nang ma hoi. ((hieu van) OR (thien van)) bac tuc xa thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sanh)) vu nang ma hoi. ((hieu van) OR (thien van)) bac tuc xa thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) vu nang ma hoi. ((hieu van) OR (thien van)) bac tuc xa thanh vi cua tre*.