Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thuc gia » thuc giai, thue gia, thuc dia
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
su sach » so sach
dat cua » dai cua, day cua, mat cua
vu sach » vu bach, vu khach
cua te » cua tu
mo hoc » mon hoc, co hoc
o hoc » co hoc, so hoc, y hoc

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) or (vu sach)) ky nang ((o hoc) or (mo hoc)). hieu van nam thuc gia thanh dat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ((o hoc) OR (mo hoc)). hieu van nam thuc gia thanh dat cua te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang ((o hoc) or (mo hoc)). hieu van nam thuc gia thanh dat cua te*.