Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
nang ma » tang ma, sang ma, nang cao
hanh di » hanh vi, hanh de, hang di
tu sach » su sach, te sach, tu cach
ma hoi » mai hoi, xa hoi, ma hoa
luc va » tuc va, loc va
di cau » da cau, diem cau

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 van cham ((luc va) or (duc va)) hanh di 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 van cham ((luc va) OR (duc va)) hanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu van cham ((luc va) or (duc va)) hanh di cau tren*.