Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dang tay » dang xay, dung tay, dan tay
trinh vi » trinh va, trinh ve, trinh viet
hieu van » hieu va, thien van, lieu va
ky dang » ky nang, ky danh
tay hoi » tay ho, tao hoi, tay thai
te sach » toc sach
tinh vi » tinh voi, tinh va, dinh vi
tu sach » thu sach, su sach, tu cach

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)) ky dang tay hoi. hieu van nam cua ban ((tinh vi) or (trinh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky dang tay hoi. hieu van nam cua ban ((tinh vi) OR (trinh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky dang tay hoi. hieu van nam cua ban ((tinh vi) or (trinh vi)) cau tren*.