Perhaps you should try some spelling variations:
trang ha » trang va, trung ha, tang ha
phat cuu » phat cua, nhat cua, chat cua
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu va » cuu van, cuu ve
vai va » mai va, dai va, hai va
thiet » thieu

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 ky ((tang xa) or (trang ha)) hoi. hieu va phat cuu va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((tang xa) OR (trang ha)) hoi. hieu va phat cuu va hanh vai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((tang xa) or (trang ha)) hoi. hieu va phat cuu va hanh vai va thiet*.