Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
truoc va » truc va, thuoc va, truong va
vinh cuu » dinh cuu, dinh cu, tinh cua
sinh cua » manh cua, dinh cuu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
sinh va » sinh vat, tinh va, dinh van
va lam » van lam, va lap

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 ky nang x ho. hieu va lam truoc va hanh ((vinh cuu) or (((sinh cua) OR (sinh va)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x ho. hieu va lam truoc va hanh ((vinh cuu) OR (((sinh cua) OR (sinh va)))) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x ho. hieu va lam truoc va hanh ((vinh cuu) or (((sinh cua) OR (sinh va)))) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x ho. hieu va lam truoc va hanh ((vinh cuu) or (((sinh cua) OR (sinh va)))) tre*.