Perhaps you should try some spelling variations:
lam ngoc » pham ngoc, lam nguoi, lang ngoc
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
lam loc » lam duoc
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
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: tu sach y ((nang ma) or (sang ma)) hoi. hieu va ((lam loc) OR (lam ngoc)) va hanh di cuu tre~.
• 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) OR (lam ngoc)) va hanh di cuu tre.
• 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) OR (lam ngoc)) va hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) or (sang ma)) hoi. hieu va ((lam loc) OR (lam ngoc)) va hanh di cuu tre*.