Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hanh tai » hang tai, han tai, hinh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
anh hay » anh ha, anh han, anh xay
hay hon » hay khong, cay hong, hay song
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
ky anh » ky danh, ly anh, ty anh
ve cac » va cac, vien cac
thiet » thieu

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 ky anh hay hon. hieu ve cac tuc van ((hanh tai) or (thanh tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky anh hay hon. hieu ve cac tuc van ((hanh tai) OR (thanh tai)) va thiet.
• Adding a wildcard symbol may retrieve word variants: te sach ky anh hay hon. hieu ve cac tuc van ((hanh tai) or (thanh tai)) va thiet*.