Perhaps you should try some spelling variations:
tat thanh » tai thanh, ta thanh, tat thang
thien van » thi van
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
thuc tat » thuc vat, thuc tap, thuc tai
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, tu cach
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
te sach » toc sach
vi cau » va cau, ve cau, di cau
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) or (te sach))) or (so sach)) ky nang ma hoi. thien van nam thuc tat thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (te sach))) OR (so sach)) ky nang ma hoi. thien van nam thuc tat thanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (te sach))) or (so sach)) ky nang ma hoi. thien van nam thuc tat thanh vi cau tren*.