Perhaps you should try some spelling variations:
dung trung » dung trong, quang trung, dung ung
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
va thanh » gia thanh, ban thanh, va tinh
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ma hoa. hieu van phan duc va thanh lai ((dung trung) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoa. hieu van phan duc va thanh lai ((dung trung) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoa. hieu van phan duc va thanh lai ((dung trung) or (cau tren))*.