Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » thuat sach, thuoc sach, khau sach
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cau tren » cu tren, dau tren, ca tren
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
nam luc » nang luc, nhan luc, nam thuc
tai cau » tai cac, tai cao
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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))) or (thu hoach)) ky nang ma hoi. hieu van nam luc va thanh tai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (thu hoach)) ky nang ma hoi. hieu van nam luc va thanh tai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thu sach))) or (thu hoach)) ky nang ma hoi. hieu van nam luc va thanh tai cau tren*.