Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
dua tren » dung tren
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
dai hai » dai hoi, dai tai, dai thao
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo

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 ((dai hai) OR (dai han)). hieu vu pham duc va thanh lai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((dai hai) OR (dai han)). hieu vu pham duc va thanh lai ((dua tren) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((dai hai) OR (dai han)). hieu vu pham duc va thanh lai ((dua tren) or (cuu tre))*".