Perhaps you should try some spelling variations:
may nang » may nong, ky nang, cam nang
te sach » toc sach
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
dan dau » danh dau, doan dau, van dau
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((may nang) or (v nang)) ma hoi. hieu va pham duc va dan dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((may nang) OR (v nang)) ma hoi. hieu va pham duc va dan dau cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((may nang) or (v nang)) ma hoi. hieu va pham duc va dan dau cua tre*.