Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
lam loc » lam duoc, lam ngoc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
loc va » hoc va, luc va
va lam » van lam, va lap

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 y ((nang ma) or (sang ma)) hoi. hieu va lam loc va ((hanh di) OR (hang di)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ma) OR (sang ma)) hoi. hieu va lam loc va ((hanh di) OR (hang di)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang ma) or (sang ma)) hoi. hieu va lam loc va ((hanh di) OR (hang di)) cau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) or (sang ma)) hoi. hieu va lam loc va ((hanh di) OR (hang di)) cau treo*.