Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
thanh toan » thanh hoa, thanh san, tinh toan
nuoc sach » nguoi sach, hoc sach, cuoc cach
hang tai » hang va, dung tai
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao
y tang » ky tang, 6 tang, 7 tang
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: ((thuoc sach) OR (nuoc sach)) y tang xa hoi. hieu va cao tuc va ((hang tai) or (thanh toan)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (nuoc sach)) y tang xa hoi. hieu va cao tuc va ((hang tai) OR (thanh toan)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (nuoc sach)) y tang xa hoi. hieu va cao tuc va ((hang tai) or (thanh toan)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (nuoc sach)) y tang xa hoi. hieu va cao tuc va ((hang tai) or (thanh toan)) cua te*.