Perhaps you should try some spelling variations:
gianh lai » gian lan
toc sac » toc sach, toc san, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau
loc va » hoc va, luc va
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang xa hoi. hieu va cau ((loc va) or (tuc va)) gianh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang xa hoi. hieu va cau ((loc va) OR (tuc va)) gianh lai cua te.
• Adding a wildcard symbol may retrieve word variants: toc sac ky lang xa hoi. hieu va cau ((loc va) or (tuc va)) gianh lai cua te*.