Perhaps you should try some spelling variations:
thien van » thi van
tan thanh » tran thanh, tang thanh, toan thanh
hieu van » lieu va, hieu ve
tu sach » thu sach, su sach, te sach
san cua » sang cua, ban cua, dan cua
luc tan » luc tai, duc tan, luc tam
bao luc » bao thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 v nang x hoi. ((((hieu van) OR (hieu va))) or (thien van)) bao luc tan thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. ((((hieu van) OR (hieu va))) OR (thien van)) bao luc tan thanh san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang x hoi. ((((hieu van) OR (hieu va))) or (thien van)) bao luc tan thanh san cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang x hoi. ((((hieu van) OR (hieu va))) or (thien van)) bao luc tan thanh san cua tre*.