Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
y nang » ky nang, ly nang, v nang
va cam » va cac, va cao, va cau
va cai » va cac, va bai, va dai
vi tan » vi than, vi toan, vi van
trieu » thieu, trien, tieu

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 y nang xa hoi. hieu ((((va cam) OR (va cai))) or (va cham)) duc tan hanh vi tan trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu ((((va cam) OR (va cai))) OR (va cham)) duc tan hanh vi tan trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. hieu ((((va cam) OR (va cai))) or (va cham)) duc tan hanh vi tan trieu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu ((((va cam) OR (va cai))) or (va cham)) duc tan hanh vi tan trieu*.