Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
gat thanh » dat thanh, tat thanh, gian thanh
sach duoc » sach nuoc, sach dao, sach dung
vat thanh » dat thanh, tat thanh, viet thanh
sach vuc » sach nuoc, sach truc, sach bac
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach vuc) or (sach duoc)) nang x ho. hieu ve cham thuc ((vat thanh) OR (gat thanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vuc) OR (sach duoc)) nang x ho. hieu ve cham thuc ((vat thanh) OR (gat thanh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vuc) or (sach duoc)) nang x ho. hieu ve cham thuc ((vat thanh) OR (gat thanh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach vuc) or (sach duoc)) nang x ho. hieu ve cham thuc ((vat thanh) OR (gat thanh)) di cuu tre*.