Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
gianh lai » gian lan
toc sach » hoc sach, doc sach, nuoc sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
tuc va » thuc va, truc va, tuc xa
va cau » van cau, va cac, va dau
loc va » hoc va, luc va
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 sach) OR (thuoc sach)) ky tang 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 sach) OR (thuoc sach)) ky tang xa hoi. hieu va cau ((loc va) OR (tuc va)) gianh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky tang xa hoi. hieu va cau ((loc va) or (tuc va)) gianh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky tang xa hoi. hieu va cau ((loc va) or (tuc va)) gianh lai cua te*.