Perhaps you should try some spelling variations:
truc ngan » tu ngan, thu ngan, tri ngan
van doan » van doanh, van toan, van hoan
sach ty » sach y, sach tu, sach thu
ca tren » cau tren, cu tren, co tren
hang di » hang doi, hang vi, hang dien
tu sach » thu sach, su sach, te sach
va doan » va doanh, va dan, va don
ty nang » ky nang, ty xang, ty hang
la tren » loai tren, dua tren, dat tren
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu ((va doan) OR (van doan)) truc ngan hang di ((ca tren) or (la tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ((va doan) OR (van doan)) truc ngan hang di ((ca tren) OR (la tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ((va doan) OR (van doan)) truc ngan hang di ((ca tren) or (la tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ((va doan) OR (van doan)) truc ngan hang di ((ca tren) or (la tren))*.