Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh dai » trinh dai, tinh da, tinh hai
trang va » tran van, hang va
trung va » truong va, trung ha, trung tam
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
me hoi » le hoi
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 y nang ((me hoi) or (mai hoi)). hieu va chat ((trung va) OR (trang va)) tinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((me hoi) OR (mai hoi)). hieu va chat ((trung va) OR (trang va)) tinh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((me hoi) or (mai hoi)). hieu va chat ((trung va) OR (trang va)) tinh dai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((me hoi) or (mai hoi)). hieu va chat ((trung va) OR (trang va)) tinh dai cua te*.