Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
dai hai » dai han, dai hoi, dai tai
hieu vu » hieu va, hieu ve, hieu su
vu chat » va chat, ve chat, du chat
tu sac » tu sach, tu san, tu bac
tac va » tac da, tac xa, tuc va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu cac)) ky nang dai hai. hieu vu chat ((tac va) or (duc va)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) ky nang dai hai. hieu vu chat ((tac va) OR (duc va)) hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu cac)) ky nang dai hai. hieu vu chat ((tac va) or (duc va)) hanh vi cua tu*.