Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh thai » hinh thai, hanh tai, anh thai
trang xa » trang va, trang ha, trong xa
cua tre » cua te, cuu tre, cua triet
tang xa » tang ma, lang xa, tang ha
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
su sai » su tai, su hai, su dai
sai ky » sac ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky ((tang xa) or (trang xa)) hoi. hieu ve cam duc van ((hanh thai) OR (nhanh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((tang xa) OR (trang xa)) hoi. hieu ve cam duc van ((hanh thai) OR (nhanh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((tang xa) or (trang xa)) hoi. hieu ve cam duc van ((hanh thai) OR (nhanh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((tang xa) or (trang xa)) hoi. hieu ve cam duc van ((hanh thai) OR (nhanh thai)) cua tre*.