Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
toc sach » hoc sach, doc sach, thuoc sach
tinh ket » dinh ket, tinh yeu, tinh yen
cam truc » cau truc, nam truc, nam truoc
va trien » va truyen, va thiet, va tuyen
hieu va » lieu va, hieu qua
va tinh » may tinh
ky lang » ky dang, ky tang, tay lang
ket va » ket van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky lang) or (ky nang)) xa hoi. hieu va ((cam truc) OR (lam truoc)) va tinh ket va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky nang)) xa hoi. hieu va ((cam truc) OR (lam truoc)) va tinh ket va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) or (ky nang)) xa hoi. hieu va ((cam truc) OR (lam truoc)) va tinh ket va trien".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) or (ky nang)) xa hoi. hieu va ((cam truc) OR (lam truoc)) va tinh ket va trien*.