Perhaps you should try some spelling variations:
tinh yen » tinh yeu, tinh dien, tinh son
va tuyen » va truyen, tac tuyen, ke tuyen
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
tuc va » thuc va, truc va, duc va
yen va » nen va, gen va, yen vy
va cao » va cac, va co, va dao

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) OR (sach y)) lang xa hoi. hieu va cao ((tuc va) or (tuc xa)) tinh yen va tuyen~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) lang xa hoi. hieu va cao ((tuc va) OR (tuc xa)) tinh yen va tuyen.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sach y)) lang xa hoi. hieu va cao ((tuc va) or (tuc xa)) tinh yen va tuyen".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) OR (sach y)) lang xa hoi. hieu va cao ((tuc va) or (tuc xa)) tinh yen va tuyen*.