Perhaps you should try some spelling variations:
giai thanh » gia thanh, gian thanh, giay thanh
thanh lai » thanh hai, thanh lap, thanh loi
dua tren » dung tren
nang mai » nang ma, lang mai, nang cai
nang tai » hang tai, tang tai, sang tai
te sach » toc sach
cham so » cham soc, cham o, ham so
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
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 mai) OR (nang tai)) hoi. hieu ve cham so giai thanh lai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang mai) OR (nang tai)) hoi. hieu ve cham so giai thanh lai ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang mai) OR (nang tai)) hoi. hieu ve cham so giai thanh lai ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang mai) OR (nang tai)) hoi. hieu ve cham so giai thanh lai ((dua tren) or (cuu tre))*.