Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
van hanh » van thanh, ban hanh, van anh
tham soc » cham soc, tham nuoc, thai son
tai cua » thai cua, tai cuc, dai cua
soc van » hoc van, oc van, sac van
su sach » so sach, vu sach
tai roi » lai roi, tai hoi, tai loi
y nang » ky nang, ly nang, may nang
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: su sach ((y nang) OR (v nang)) tai roi. hieu van tham soc van hanh ((tai cua) or (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) tai roi. hieu van tham soc van hanh ((tai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) tai roi. hieu van tham soc van hanh ((tai cua) or (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) tai roi. hieu van tham soc van hanh ((tai cua) or (tri cua)) te*.