Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong, tu trong
va xanh » va danh, va hanh, va banh
te sach » toc sach
lam loc » lam duoc, lam ngoc
v nang » va nang, vu nang, van nang
va lam » van lam, va lap
y nang » ky nang, ly nang, may nang
va anh » van anh, va danh, va hanh
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. lieu va lam loc ((va xanh) OR (va anh)) 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. lieu va lam loc ((va xanh) OR (va anh)) 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. lieu va lam loc ((va xanh) OR (va anh)) di tu tieng".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) xa hoi. lieu va lam loc ((va xanh) OR (va anh)) di tu tieng*.