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

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 ve 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 ve nam cua ban ((tinh vi) OR (trinh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky dang tay hoi. hieu ve 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 ve nam cua ban ((tinh vi) OR (trinh vi)) cau tren*.