Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
thu sach » tu sach, thuat sach, thu hoach
sinh dai » sinh thai, si dai, sinh vat
hoc sach » hoc sinh, hoc cac, hoc anh
va sinh » va kinh, va tinh, vi sinh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (((thuoc sach) or (hoc sach)))) ky tang xa hoi. hieu ve cau luc va sinh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (((thuoc sach) OR (hoc sach)))) ky tang xa hoi. hieu ve cau luc va sinh dai cua su.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (((thuoc sach) or (hoc sach)))) ky tang xa hoi. hieu ve cau luc va sinh dai cua su*.