Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
moi su » oi su, mai su, moi tu
doi su » oi su, don su, voi su
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang o lai. lieu va ((lam truoc) or (nam thuc)) va thanh ((moi su) OR (doi su)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o lai. lieu va ((lam truoc) OR (nam thuc)) va thanh ((moi su) OR (doi su)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang o lai. lieu va ((lam truoc) or (nam thuc)) va thanh ((moi su) OR (doi su)) viet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang o lai. lieu va ((lam truoc) or (nam thuc)) va thanh ((moi su) OR (doi su)) viet*.