Perhaps you should try some spelling variations:
lam ngoc » pham ngoc, lam nguoi, lang ngoc
te sach » toc sach
hieu va » lieu va, hieu qua
ngoc va » nuoc va, ngoc ha, goc va
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
tu tren » tu truyen, tu tieng, tu trong
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va lam » van lam, va lap
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 ngoc va xanh di tu tren~.
• 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 ngoc va xanh di tu tren.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) xa hoi. hieu va lam ngoc va xanh di tu tren*.