Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cham luc » cham soc, nhan luc, cham cuu
nang mai » nang ma, nang tai, lang mai
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va danh, ban hanh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
ly cua » le cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach ty)) nang mai hoi. hieu ve cham luc ((va hanh) OR (va thanh)) ly cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) nang mai hoi. hieu ve cham luc ((va hanh) OR (va thanh)) ly cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach ty)) nang mai hoi. hieu ve cham luc ((va hanh) OR (va thanh)) ly cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach ty)) nang mai hoi. hieu ve cham luc ((va hanh) OR (va thanh)) ly cua tre*.