Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
thu sach » thuat sach, thuoc sach, thu hoach
thuc vay » thuc vat, thuc day, thuc va
vay doan » vay doanh, van doan, van doanh
doan van » doan va, hoang van, luan van
cau tren » cu tren, dau tren, ca tren
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
van cau » van dau, van hau, van chat
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 (thu sach)) ky nang ma hoi. hieu va nham thuc vay doan van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu va nham thuc vay doan van cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu va nham thuc vay doan van cau tren*.