Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
van dung » van dong, xay dung, tin dung
cau tren » dau tren, ca tren, cau treo
dang cac » dung cac, bang cac, dong cac
cac khoi » cac thoi, cac khoan, cach thoi
truc van » truc va, thuc van, truc ban
cuu tre » cua tre, cau treo
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
ky dang » ky nang, ky danh
cu tren » tu tren, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky dang cac khoi. lieu va cham truc van dung tai ((cuu tre) or (((cau tren) OR (cu tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang cac khoi. lieu va cham truc van dung tai ((cuu tre) OR (((cau tren) OR (cu tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang cac khoi. lieu va cham truc van dung tai ((cuu tre) or (((cau tren) OR (cu tren))))".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang cac khoi. lieu va cham truc van dung tai ((cuu tre) or (((cau tren) OR (cu tren))))*.