Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh loi, thanh tai
thanh lap » thanh san, phan lap, thanh hai
dua tren » dung tren
sach ty » sach y, sach tu, sach thu
te sach » toc sach
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 hoi. hieu ve pham duc va ((thanh lai) OR (thanh lap)) ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. hieu ve pham duc va ((thanh lai) OR (thanh lap)) ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. hieu ve pham duc va ((thanh lai) OR (thanh lap)) ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. hieu ve pham duc va ((thanh lai) OR (thanh lap)) ((dua tren) or (cuu tre))*.