Perhaps you should try some spelling variations:
luyen tre » luyen tri, huyen tren, tuyen tren
hoc sach » hoc sinh, hoc cac, hoc anh
cham tuc » nham thuc, pham thuc, tham thuc
vi luyen » vi xuyen, va luyen, bai luyen
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sach) or (su sach))) or (hoc sach)) ky lang xa hoi. lieu va cham tuc va hanh vi luyen tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (hoc sach)) ky lang xa hoi. lieu va cham tuc va hanh vi luyen tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (su sach))) or (hoc sach)) ky lang xa hoi. lieu va cham tuc va hanh vi luyen tre*.