Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien dang » thien bang, thien danh, thien nang
cau tren » cu tren, dau tren, ca tren
cham luc » cham soc, nhan luc, cham cuu
dang xay » dang van, van xay
hanh cac » hang cac, hanh cat, nhanh cay
van hanh » van thanh, ban hanh, van anh
cac cau » cac mau, bac cau, ca cau
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi

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 thien dang xay hoi. ((hieu ve) or (hieu va)) cham luc van hanh cac cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thien dang xay hoi. ((hieu ve) OR (hieu va)) cham luc van hanh cac cau tren*.