Perhaps you should try some spelling variations:
dinh dinh » binh dinh, hinh dinh, dinh kinh
hoc sach » hoc sinh, hoc anh
dinh chi » dinh thi, dinh tri, dinh moi
thi nang » thi cong, ki nang, thi hanh
than luc » nhan luc, than duc, thanh luu
van than » van thanh, van thang, van tuan
thi van » thi lan, thi hanh
va dinh » van dinh, va kinh, va tinh
nang ma » tang ma, sang ma, nang cao
hoc cac » hoc cao
chi tre » choi tre, cho tre, chi tro
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (((hoc sach) or (hoc cac)))) thi nang ma hoi. thi van than luc va dinh dinh chi tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (((hoc sach) OR (hoc cac)))) thi nang ma hoi. thi van than luc va dinh dinh chi tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (((hoc sach) or (hoc cac)))) thi nang ma hoi. thi van than luc va dinh dinh chi tre*.