Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dien cua » dieu cua, dien cuc, dien cu
dan dien » doan dien, danh dien, dan den
cham duc » cham soc, pham duy, phan duc
tai khoi » tai khoa, mai khoi, tao khoi
hieu vu » hieu va, hieu ve, hieu su
tai hoe » tai he, tai khoa, thai hoc
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
va dan » ca dan, va dao, va dau
v nang » va nang, vu nang, van 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 v nang ((tai hoe) or (tai khoi)). hieu vu ((cham duc) or (pham duc)) va dan dien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang ((tai hoe) OR (tai khoi)). hieu vu ((cham duc) OR (pham duc)) va dan dien cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((tai hoe) or (tai khoi)). hieu vu ((cham duc) or (pham duc)) va dan dien cua tre*.