Perhaps you should try some spelling variations:
thien van » thi van
hai truc » hai trac, hang truc, thai thuc
hanh vai » hanh vi, hanh va, hanh tai
dai truc » dai thuc, doan truc, dai trung
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
xac ky » cac ky, sac ky, bac ky
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky ((nang xa) or (tang ma)) hoi. thien van ((hai truc) OR (dai truc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky ((nang xa) OR (tang ma)) hoi. thien van ((hai truc) OR (dai truc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky ((nang xa) or (tang ma)) hoi. thien van ((hai truc) OR (dai truc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky ((nang xa) or (tang ma)) hoi. thien van ((hai truc) OR (dai truc)) va hanh vai cua tre*.