Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
tinh dai » trinh dai, tinh da, tinh hai
doc sach » hoc sach, nuoc sach, dac sac
trung va » truong va, trang va, trung ha
ha trung » he trung, ba trung, va trung
va tinh » may tinh
mai hoi » mai khoi, dai hoi, lai hoi
qua ha » quan ha, qua hai, qua ca
cua te » cua tu
me hoi » le hoi
y nang » ky nang, ly nang, v nang

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 (doc sach)) y nang ((me hoi) or (mai hoi)). hieu qua ha trung va tinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y nang ((me hoi) OR (mai hoi)). hieu qua ha trung va tinh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang ((me hoi) or (mai hoi)). hieu qua ha trung va tinh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y nang ((me hoi) or (mai hoi)). hieu qua ha trung va tinh dai cua te*.