Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong, tu trong
lam ngoc » pham ngoc, lam nguoi, lang ngoc
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
te sach » toc sach
hieu va » lieu va, hieu qua
lam loc » lam duoc
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
di tu » dai tu, de tu, do tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y nang) or (v nang)) xa hoi. hieu va ((lam loc) OR (lam ngoc)) va xanh di tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) xa hoi. hieu va ((lam loc) OR (lam ngoc)) va xanh di tu tieng.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (v nang)) xa hoi. hieu va ((lam loc) OR (lam ngoc)) va xanh di tu tieng".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) xa hoi. hieu va ((lam loc) OR (lam ngoc)) va xanh di tu tieng*.