Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
trinh vi » trinh va, trinh ve, trinh viet
cau tren » cu tren, dau tren, ca tren
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
cam cua » ca cua, nam cua, cau cua
te sach » toc sach
tinh vi » tinh voi, tinh va, dinh vi
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (te sach)) ky dang xay hoi. hieu ve cam cua ban ((tinh vi) OR (trinh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky dang xay hoi. hieu ve cam cua ban ((tinh vi) OR (trinh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky dang xay hoi. hieu ve cam cua ban ((tinh vi) OR (trinh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky dang xay hoi. hieu ve cam cua ban ((tinh vi) OR (trinh vi)) cau tren*.