Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
nam thuc » nam thuoc, nam thu, nam tu
hanh tai » hang tai, han tai, hinh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
lieu ha » lieu nha, lieu va, liem ha
cu tren » tu tren, dua tren
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: tu sach ky nang ma hoi. lieu ha ((nam thuc) or (am thuc)) xa ((hanh tai) OR (thanh tai)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. lieu ha ((nam thuc) OR (am thuc)) xa ((hanh tai) OR (thanh tai)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. lieu ha ((nam thuc) or (am thuc)) xa ((hanh tai) OR (thanh tai)) cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. lieu ha ((nam thuc) or (am thuc)) xa ((hanh tai) OR (thanh tai)) cu tren*.