Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cam truc » nam truc, lam truoc, nam truoc
tinh ket » dinh ket, tinh yeu, tinh yen
va trien » va truyen, va thiet, va tuyen
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tinh » may tinh
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 xa hoi. hieu va ((cam truc) OR (cau truc)) va tinh ket va trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu va ((cam truc) OR (cau truc)) va tinh ket va trien".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu va ((cam truc) OR (cau truc)) va tinh ket va trien*.