Perhaps you should try some spelling variations:
hieu tre » hieu tren, hieu triet, chieu tro
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tre can » tre dan, tiep can, tiem can
va hanh » van hanh, va thanh, ban hanh
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang x hoi. hieu tre can bo va hanh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu tre can bo va hanh vi cau tren*.